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API dokumentace

Sending and deliverability

Senders, sending domains (SPF, DKIM, DMARC), DMARC reports, sending mode.

Technická reference je anglicky (stejně jako strojově čitelný dokument OpenAPI). Celou skupinu pro AI agenta načtete z /api/openapi.json?tag=Sending.

Přihlášení: Authorization: Bearer pst_... nebo HTTP Basic (e-mail člena firmy a API klíč).

Operace

MetodaCestaPopis
GET/api/v1/tenants/{tenant}/deliverability/dmarcDMARC summary
GET/api/v1/tenants/{tenant}/deliverability/dmarc/reportDMARC report detail
GET/api/v1/tenants/{tenant}/deliverability/domainsList domains with their DNS state
POST/api/v1/tenants/{tenant}/deliverability/domainsAdd a domain
PATCH/api/v1/tenants/{tenant}/deliverability/domains/{domain_id}Update a domain
DELETE/api/v1/tenants/{tenant}/deliverability/domains/{domain_id}Delete a domain
POST/api/v1/tenants/{tenant}/deliverability/domains/{domain_id}/checkCheck the DNS records of a domain now
GET/api/v1/tenants/{tenant}/deliverability/sendersSenders with their authentication state
GET/api/v1/tenants/{tenant}/sending-defaultsGet the default settings of new campaigns (tracking parameters on or off)
PUT/api/v1/tenants/{tenant}/sending-defaultsSet whether new campaigns start with tracking parameters
GET/api/v1/tenants/{tenant}/sending-modeSending mode of the company (switch, limits)
POST/api/v1/tenants/{tenant}/sending/domainsAdd a sending domain
DELETE/api/v1/tenants/{tenant}/sending/domains/{domain_id}Delete a sending domain
POST/api/v1/tenants/{tenant}/sending/domains/{domain_id}/checkCheck a sending domain
POST/api/v1/tenants/{tenant}/sending/sendersAdd a sender
PATCH/api/v1/tenants/{tenant}/sending/senders/{sender_id}Update a sender
DELETE/api/v1/tenants/{tenant}/sending/senders/{sender_id}Delete a sender
POST/api/v1/tenants/{tenant}/sending/senders/{sender_id}/checkCheck whether a sender address is confirmed
POST/api/v1/tenants/{tenant}/sending/senders/{sender_id}/resendSend the confirmation e-mail of a sender address again
GET/api/v1/tenants/{tenant}/sending/senders/{sender_id}/usageWhere a sender is used
GET/api/v1/tenants/{tenant}/sending/setupState of the sending setup (domains and senders)

DMARC summary

GET /api/v1/tenants/{tenant}/deliverability/dmarc

Oprávnění: modul settings, úroveň read; klíč s přístupem read nebo full

Parametry

NázevKdeTypPovinnéPopis
tenantpathstring (uuid)anoPublic id of the company (tenant), a UUID: GET /api/v3/account-info answers it as data.guid; the app shows it on the API keys page.

Odpovědi

Chyby

StavKódHodnoty message
401401 unauthorized: missing, unknown, revoked, expired or idle API key.
403403 forbidden: message tenant (another company), scope (read-only key), api_key (person only), or the module the key's roles lack.
429429 rate_limited: wait Retry-After seconds.

DMARC report detail

GET /api/v1/tenants/{tenant}/deliverability/dmarc/report

Oprávnění: modul settings, úroveň read; klíč s přístupem read nebo full

SE Statistiky › DMARC: ?from=&to= (calendar days of the tenant, both included; none = the whole history), ?domain= (sending domain id), ?reporter= (the provider's org name).

Parametry

NázevKdeTypPovinnéPopis
tenantpathstring (uuid)anoPublic id of the company (tenant), a UUID: GET /api/v3/account-info answers it as data.guid; the app shows it on the API keys page.
domainquerystringne
fromquerystringneStart of the period (YYYY-MM-DD local day, or ISO time where noted).
reporterquerystringne
toquerystringneEnd of the period (YYYY-MM-DD local day, or ISO time where noted).

Odpovědi

Chyby

StavKódHodnoty message
400validationto
401401 unauthorized: missing, unknown, revoked, expired or idle API key.
403403 forbidden: message tenant (another company), scope (read-only key), api_key (person only), or the module the key's roles lack.
429429 rate_limited: wait Retry-After seconds.

List domains with their DNS state

GET /api/v1/tenants/{tenant}/deliverability/domains

Oprávnění: modul settings, úroveň read; klíč s přístupem read nebo full

Parametry

NázevKdeTypPovinnéPopis
tenantpathstring (uuid)anoPublic id of the company (tenant), a UUID: GET /api/v3/account-info answers it as data.guid; the app shows it on the API keys page.

Odpovědi

Chyby

StavKódHodnoty message
401401 unauthorized: missing, unknown, revoked, expired or idle API key.
403403 forbidden: message tenant (another company), scope (read-only key), api_key (person only), or the module the key's roles lack.
429429 rate_limited: wait Retry-After seconds.

Add a domain

POST /api/v1/tenants/{tenant}/deliverability/domains

Oprávnění: modul settings, úroveň full; klíč s přístupem full

Parametry

NázevKdeTypPovinnéPopis
tenantpathstring (uuid)anoPublic id of the company (tenant), a UUID: GET /api/v3/account-info answers it as data.guid; the app shows it on the API keys page.

Tělo požadavku (application/json): Required by the server: domain.

PoleTypPovinnéPopis
domainstringano
dkimSelectorsarray of stringne

Odpovědi

Chyby

StavKódHodnoty message
400validation
401401 unauthorized: missing, unknown, revoked, expired or idle API key.
403403 forbidden: message tenant (another company), scope (read-only key), api_key (person only), or the module the key's roles lack.
429429 rate_limited: wait Retry-After seconds.

Update a domain

PATCH /api/v1/tenants/{tenant}/deliverability/domains/{domain_id}

Oprávnění: modul settings, úroveň full; klíč s přístupem full

Parametry

NázevKdeTypPovinnéPopis
tenantpathstring (uuid)anoPublic id of the company (tenant), a UUID: GET /api/v3/account-info answers it as data.guid; the app shows it on the API keys page.
domain_idpathstringanoId of the domain (string of digits).

Tělo požadavku (application/json): Required by the server: dkimSelectors.

PoleTypPovinnéPopis
dkimSelectorsarray of stringano

Odpovědi

Chyby

StavKódHodnoty message
400validation
401401 unauthorized: missing, unknown, revoked, expired or idle API key.
403403 forbidden: message tenant (another company), scope (read-only key), api_key (person only), or the module the key's roles lack.
404not_found
429429 rate_limited: wait Retry-After seconds.

Delete a domain

DELETE /api/v1/tenants/{tenant}/deliverability/domains/{domain_id}

Oprávnění: modul settings, úroveň full; klíč s přístupem full

Parametry

NázevKdeTypPovinnéPopis
tenantpathstring (uuid)anoPublic id of the company (tenant), a UUID: GET /api/v3/account-info answers it as data.guid; the app shows it on the API keys page.
domain_idpathstringanoId of the domain (string of digits).

Odpovědi

  • 204 No content

Chyby

StavKódHodnoty message
400validation
401401 unauthorized: missing, unknown, revoked, expired or idle API key.
403403 forbidden: message tenant (another company), scope (read-only key), api_key (person only), or the module the key's roles lack.
404not_found
429429 rate_limited: wait Retry-After seconds.

Check the DNS records of a domain now

POST /api/v1/tenants/{tenant}/deliverability/domains/{domain_id}/check

Oprávnění: modul settings, úroveň full; klíč s přístupem full

Parametry

NázevKdeTypPovinnéPopis
tenantpathstring (uuid)anoPublic id of the company (tenant), a UUID: GET /api/v3/account-info answers it as data.guid; the app shows it on the API keys page.
domain_idpathstringanoId of the domain (string of digits).

Odpovědi

Chyby

StavKódHodnoty message
400validation
401401 unauthorized: missing, unknown, revoked, expired or idle API key.
403403 forbidden: message tenant (another company), scope (read-only key), api_key (person only), or the module the key's roles lack.
404not_found
429429 rate_limited: wait Retry-After seconds.
503unavailabledns

Senders with their authentication state

GET /api/v1/tenants/{tenant}/deliverability/senders

Oprávnění: modul settings, úroveň read; klíč s přístupem read nebo full

Parametry

NázevKdeTypPovinnéPopis
tenantpathstring (uuid)anoPublic id of the company (tenant), a UUID: GET /api/v3/account-info answers it as data.guid; the app shows it on the API keys page.

Odpovědi

  • 200 OK: application/json object

Chyby

StavKódHodnoty message
401401 unauthorized: missing, unknown, revoked, expired or idle API key.
403403 forbidden: message tenant (another company), scope (read-only key), api_key (person only), or the module the key's roles lack.
429429 rate_limited: wait Retry-After seconds.

Get the default settings of new campaigns (tracking parameters on or off)

GET /api/v1/tenants/{tenant}/sending-defaults

Oprávnění: modul settings, úroveň read; klíč s přístupem read nebo full

SE Nastavení › Rozesílky › Výchozí nastavení beyond what other routes keep (senders, test recipients, the default unsubscribe page): {utmDefaultOn} = new campaign drafts start with the tracking parameters on.

Parametry

NázevKdeTypPovinnéPopis
tenantpathstring (uuid)anoPublic id of the company (tenant), a UUID: GET /api/v3/account-info answers it as data.guid; the app shows it on the API keys page.

Odpovědi

Chyby

StavKódHodnoty message
401401 unauthorized: missing, unknown, revoked, expired or idle API key.
403403 forbidden: message tenant (another company), scope (read-only key), api_key (person only), or the module the key's roles lack.
429429 rate_limited: wait Retry-After seconds.

Set whether new campaigns start with tracking parameters

PUT /api/v1/tenants/{tenant}/sending-defaults

Oprávnění: modul settings, úroveň full; klíč s přístupem full

Body {utmDefaultOn: bool} (SE UTM Parametry Nesledovat / Sledovat). Audited as setting_changed.

Parametry

NázevKdeTypPovinnéPopis
tenantpathstring (uuid)anoPublic id of the company (tenant), a UUID: GET /api/v3/account-info answers it as data.guid; the app shows it on the API keys page.

Tělo požadavku (application/json): Required by the server: utmDefaultOn.

PoleTypPovinnéPopis
utmDefaultOnbooleanano

Odpovědi

Chyby

StavKódHodnoty message
400validationutmDefaultOn
401401 unauthorized: missing, unknown, revoked, expired or idle API key.
403403 forbidden: message tenant (another company), scope (read-only key), api_key (person only), or the module the key's roles lack.
429429 rate_limited: wait Retry-After seconds.

Sending mode of the company (switch, limits)

GET /api/v1/tenants/{tenant}/sending-mode

Oprávnění: modul null, úroveň read; klíč s přístupem read nebo full

What leaves Poštárna for this tenant now (core/backends.mode_of): live (everything), test (only test e-mails to the test whitelist, POSTARNA_SES_LIVE=test), folder (development: files, nothing leaves) or off (nothing). testRecipients = how many addresses the test whitelist has. sendingEnabled = the tenant's kill switch (setting sending_enabled, python -m postarna.admin sending-switch): while it is off no sending tick runs, so no campaign goes out and no automation lets anybody in, whatever the mode says (test e-mails still go out). sendingState = the platform's approval of live sending (pending, live, paused, suspended; migration 0170) and sendingHold why a live tenant is held ('', platform, free_limit, unpaid).

Parametry

NázevKdeTypPovinnéPopis
tenantpathstring (uuid)anoPublic id of the company (tenant), a UUID: GET /api/v3/account-info answers it as data.guid; the app shows it on the API keys page.

Odpovědi

Chyby

StavKódHodnoty message
401401 unauthorized: missing, unknown, revoked, expired or idle API key.
403403 forbidden: message tenant (another company), scope (read-only key), api_key (person only), or the module the key's roles lack.
429429 rate_limited: wait Retry-After seconds.

Add a sending domain

POST /api/v1/tenants/{tenant}/sending/domains

Oprávnění: modul settings, úroveň full; klíč s přístupem full

Parametry

NázevKdeTypPovinnéPopis
tenantpathstring (uuid)anoPublic id of the company (tenant), a UUID: GET /api/v3/account-info answers it as data.guid; the app shows it on the API keys page.

Tělo požadavku (application/json): Required by the server: domain.

PoleTypPovinnéPopis
domainstringano

Odpovědi

Chyby

StavKódHodnoty message
400validation
401401 unauthorized: missing, unknown, revoked, expired or idle API key.
403403 forbidden: message tenant (another company), scope (read-only key), api_key (person only), or the module the key's roles lack.
429429 rate_limited: wait Retry-After seconds.

Delete a sending domain

DELETE /api/v1/tenants/{tenant}/sending/domains/{domain_id}

Oprávnění: modul settings, úroveň full; klíč s přístupem full

Parametry

NázevKdeTypPovinnéPopis
tenantpathstring (uuid)anoPublic id of the company (tenant), a UUID: GET /api/v3/account-info answers it as data.guid; the app shows it on the API keys page.
domain_idpathstringanoId of the domain (string of digits).

Odpovědi

  • 204 No content

Chyby

StavKódHodnoty message
400validation
401401 unauthorized: missing, unknown, revoked, expired or idle API key.
403403 forbidden: message tenant (another company), scope (read-only key), api_key (person only), or the module the key's roles lack.
429429 rate_limited: wait Retry-After seconds.

Check a sending domain

POST /api/v1/tenants/{tenant}/sending/domains/{domain_id}/check

Oprávnění: modul settings, úroveň full; klíč s přístupem full

Parametry

NázevKdeTypPovinnéPopis
tenantpathstring (uuid)anoPublic id of the company (tenant), a UUID: GET /api/v3/account-info answers it as data.guid; the app shows it on the API keys page.
domain_idpathstringanoId of the domain (string of digits).

Odpovědi

Chyby

StavKódHodnoty message
400validation
401401 unauthorized: missing, unknown, revoked, expired or idle API key.
403403 forbidden: message tenant (another company), scope (read-only key), api_key (person only), or the module the key's roles lack.
404not_found
429429 rate_limited: wait Retry-After seconds.

Add a sender

POST /api/v1/tenants/{tenant}/sending/senders

Oprávnění: modul settings, úroveň full; klíč s přístupem full

Parametry

NázevKdeTypPovinnéPopis
tenantpathstring (uuid)anoPublic id of the company (tenant), a UUID: GET /api/v3/account-info answers it as data.guid; the app shows it on the API keys page.

Tělo požadavku (application/json): Required by the server: email, shopId.

PoleTypPovinnéPopis
shopIdstringano
emailstringano
namestringne
replyTostringne
isDefaultbooleanne

Odpovědi

Chyby

StavKódHodnoty message
400validation
401401 unauthorized: missing, unknown, revoked, expired or idle API key.
403403 forbidden: message tenant (another company), scope (read-only key), api_key (person only), or the module the key's roles lack.
429429 rate_limited: wait Retry-After seconds.

Update a sender

PATCH /api/v1/tenants/{tenant}/sending/senders/{sender_id}

Oprávnění: modul settings, úroveň full; klíč s přístupem full

Parametry

NázevKdeTypPovinnéPopis
tenantpathstring (uuid)anoPublic id of the company (tenant), a UUID: GET /api/v3/account-info answers it as data.guid; the app shows it on the API keys page.
sender_idpathstringanoId of the sender (string of digits).

Tělo požadavku (application/json)

PoleTypPovinnéPopis
namestringneFrom name, at most 100 characters without < > { } " and line breaks.
replyTostringneAddress for replies, '' = replies go to the sender address.
isDefaulttruene

Odpovědi

Chyby

StavKódHodnoty message
400validation
401401 unauthorized: missing, unknown, revoked, expired or idle API key.
403403 forbidden: message tenant (another company), scope (read-only key), api_key (person only), or the module the key's roles lack.
429429 rate_limited: wait Retry-After seconds.

Delete a sender

DELETE /api/v1/tenants/{tenant}/sending/senders/{sender_id}

Oprávnění: modul settings, úroveň full; klíč s přístupem full

204; 409 conflict default / in_use; ?replacementId= (SE's Náhradní adresa, DO-03) first moves the shop's default, the unfinished campaigns and the automation e-mail steps to that sender of the same shop.

Parametry

NázevKdeTypPovinnéPopis
tenantpathstring (uuid)anoPublic id of the company (tenant), a UUID: GET /api/v3/account-info answers it as data.guid; the app shows it on the API keys page.
sender_idpathstringanoId of the sender (string of digits).
replacementIdquerystringne

Odpovědi

  • 204 No content

Chyby

StavKódHodnoty message
400validationreplacementId
401401 unauthorized: missing, unknown, revoked, expired or idle API key.
403403 forbidden: message tenant (another company), scope (read-only key), api_key (person only), or the module the key's roles lack.
429429 rate_limited: wait Retry-After seconds.

Check whether a sender address is confirmed

POST /api/v1/tenants/{tenant}/sending/senders/{sender_id}/check

Oprávnění: modul settings, úroveň full; klíč s přístupem full

Zkontrolovat of an address confirmed through SES (DO-03): reads the state of its identity.

Parametry

NázevKdeTypPovinnéPopis
tenantpathstring (uuid)anoPublic id of the company (tenant), a UUID: GET /api/v3/account-info answers it as data.guid; the app shows it on the API keys page.
sender_idpathstringanoId of the sender (string of digits).

Odpovědi

Chyby

StavKódHodnoty message
400validation
401401 unauthorized: missing, unknown, revoked, expired or idle API key.
403403 forbidden: message tenant (another company), scope (read-only key), api_key (person only), or the module the key's roles lack.
429429 rate_limited: wait Retry-After seconds.

Send the confirmation e-mail of a sender address again

POST /api/v1/tenants/{tenant}/sending/senders/{sender_id}/resend

Oprávnění: modul settings, úroveň full; klíč s přístupem full

Poslat znovu the confirmation e-mail of an address verified by e-mail (DO-03); 409 when it is verified already, 503 unavailable when no e-mail could go out.

Parametry

NázevKdeTypPovinnéPopis
tenantpathstring (uuid)anoPublic id of the company (tenant), a UUID: GET /api/v3/account-info answers it as data.guid; the app shows it on the API keys page.
sender_idpathstringanoId of the sender (string of digits).

Odpovědi

Chyby

StavKódHodnoty message
400validation
401401 unauthorized: missing, unknown, revoked, expired or idle API key.
403403 forbidden: message tenant (another company), scope (read-only key), api_key (person only), or the module the key's roles lack.
404not_found
409conflictverified
429429 rate_limited: wait Retry-After seconds.
503unavailableemail

Where a sender is used

GET /api/v1/tenants/{tenant}/sending/senders/{sender_id}/usage

Oprávnění: modul settings, úroveň read; klíč s přístupem read nebo full

Where a sender is used (SE "Použití odesílací adresy" before Smazat adresu): {items: [{type, id, name, status}]}, type default (its shop's default sender), campaign or automation.

Parametry

NázevKdeTypPovinnéPopis
tenantpathstring (uuid)anoPublic id of the company (tenant), a UUID: GET /api/v3/account-info answers it as data.guid; the app shows it on the API keys page.
sender_idpathstringanoId of the sender (string of digits).

Odpovědi

  • 200 OK: application/json object

Chyby

StavKódHodnoty message
400validation
401401 unauthorized: missing, unknown, revoked, expired or idle API key.
403403 forbidden: message tenant (another company), scope (read-only key), api_key (person only), or the module the key's roles lack.
404not_found
429429 rate_limited: wait Retry-After seconds.

State of the sending setup (domains and senders)

GET /api/v1/tenants/{tenant}/sending/setup

Oprávnění: modul settings, úroveň read; klíč s přístupem read nebo full

Parametry

NázevKdeTypPovinnéPopis
tenantpathstring (uuid)anoPublic id of the company (tenant), a UUID: GET /api/v3/account-info answers it as data.guid; the app shows it on the API keys page.

Odpovědi

Chyby

StavKódHodnoty message
401401 unauthorized: missing, unknown, revoked, expired or idle API key.
403403 forbidden: message tenant (another company), scope (read-only key), api_key (person only), or the module the key's roles lack.
429429 rate_limited: wait Retry-After seconds.

Schémata

DmarcReport

PoleTypPovinnéPopis
totalsobjectano
domainsarray of objectano
daysarray of objectano
ipsarray of objectano
ipVersionsobjectano
reportersarray of objectano
dispositionsarray of objectano
casesarray of objectano
reporterChoicesarray of stringano
domainChoicesarray of objectano

DmarcSummary

PoleTypPovinnéPopis
daysnumberano
domainsarray of objectano
sourcesarray of objectano
reportsarray of objectano
complaintsobjectano

Error

PoleTypPovinnéPopis
errorobjectano
json
{
  "error": {
    "code": "validation",
    "message": "email"
  }
}

SenderAuth

PoleTypPovinnéPopis
idstringano
shopIdstringano
namestringano
emailstringano
replyTostringano
domainstringano
domainIdstring or nullano
verifiedbooleanano
isDefaultbooleanano
freemailbooleanano
spfone of: ok, invalid, error, unknown, missingano
dkimone of: ok, invalid, error, unknown, missingano
dmarcone of: ok, invalid, error, unknown, missingano
usableAsSenderbooleanano

SenderUsage

One use of a sender (GET /sending/senders/{id}/usage). type default: the default sender of shop id.

PoleTypPovinnéPopis
typeone of: campaign, automation, defaultano
idstringano
namestringano
statusstringano

SendingDefaults

GET/PUT /tenants/{t}/sending-defaults (SE Výchozí nastavení, DO-07): utmDefaultOn = new drafts start with the tracking parameters utm_source newsletter and utm_medium email.

PoleTypPovinnéPopis
utmDefaultOnbooleanano

SendingDomain

PoleTypPovinnéPopis
idstringano
domainstringano
dkimSelectorsarray of stringano
spfobjectano
dkimobjectano
dmarcobjectano
issuesarray of stringanoCodes, texts in the catalogs (deliverability.issue.<code>).
checkedAtstring or nullano
createdAtstringano

SendingDomainInput

PoleTypPovinnéPopis
domainstringano
dkimSelectorsarray of stringne

SendingDomainList

PoleTypPovinnéPopis
itemsarray of SendingDomainano
suggestionsarray of stringanoDomains of sender addresses without a sending domain yet.

SendingMode

one of: live, test, folder, off

SendingModeInfo

PoleTypPovinnéPopis
modeSendingModeano
testRecipientsnumberanoHow many addresses the tenant's test list has.
sendingEnabledbooleanneThe tenant's kill switch: off = no campaign goes out and no automation lets anybody in (tests still go out).
sendingStateone of: suspended, pending, live, pausedneThe platform's approval (B4): anything but live keeps the tenant to test e-mails.
sendingHoldone of: `, free_limit, unpaid, platform`neWhy a live tenant is held: the platform switch or billing (free tier used up, unpaid invoice).

SendingSetup

PoleTypPovinnéPopis
managedbooleananoThe tenant sends through the platform account (Poštárna creates the identity).
platformReadybooleananofalse = the platform still has to finish its part (no identity credential).
domainsarray of SetupDomainano
suggestionsarray of stringano
shopsarray of objectano
sendersarray of SetupSenderano
advancedobjectnePlatform admins only.

SetupDnsRecord

PoleTypPovinnéPopis
kindone of: dkim, spf, dmarcano
typeone of: CNAME, TXTano
hoststringanoName without the domain (what most DNS hosts ask for); '@' = the domain itself.
namestringanoFull name.
valuestringano
requiredbooleanano
statusSetupRecordStatusano

SetupDomain

PoleTypPovinnéPopis
idstringano
domainstringano
stateSetupDomainStateano
recordsarray of SetupDnsRecordano
checkedAtstring or nullano
createdAtstringano
advancedobjectnePlatform admins only.

SetupDomainState

one of: pending, failed, verified, setup

SetupRecordStatus

one of: ok, unknown, missing

SetupSender

PoleTypPovinnéPopis
idstringano
shopIdstringano
namestringano
emailstringano
replyTostringano
isDefaultbooleanano
verifiedbooleanano
domainVerifiedbooleanano
verifyMethodone of: domain, emailneDO-03: domain = verified by the DKIM of its domain, email = confirmed (or waiting for) a confirmation e-mail.
verificationSentAtstring or nullneWhen the last confirmation e-mail went out; null = none could be sent.
freemailbooleanneAn address of a free mailbox service (its provider's DMARC fails for e-mails sent through Poštárna).

SetupSenderInput

PoleTypPovinnéPopis
shopIdstringano
emailstringano
namestringne
replyTostringne
isDefaultbooleanne

SetupSenderPatch

Edit of an existing sender. The address itself never changes (it belongs to a verified domain; server 400 validation email, reason read_only).

PoleTypPovinnéPopis
namestringneFrom name, at most 100 characters without < > { } " and line breaks.
replyTostringneAddress for replies, '' = replies go to the sender address.
isDefaulttruene