Send WordPress email through Postmark
Postmark is known for transactional email: password resets, receipts and notifications, the messages that must arrive quickly. It suits sites where those emails matter more than newsletters.
- SMTP, through Custom SMTP
How BooleanSMTP sends through Postmark
Through the Custom SMTP connection
In BooleanSMTP, add a mailer, choose Custom SMTP, and enter Postmark’s SMTP server below with your Postmark SMTP login. Logging, the fallback, retries and alerts work exactly as they do for every other connection.
| SMTP host | Port | Encryption |
|---|---|---|
| smtp.postmarkapp.com | 587 | TLS |
| smtp.postmarkapp.com | 2525 | TLS |
- Username
- Your server’s Server API Token
- Password
- The same Server API Token
SMTP is off for a Postmark server until you turn it on in that server’s Settings.
Checked against Postmark’s SMTP documentation.
Before you connect
Create a server in Postmark, verify your sender signature or domain, turn on SMTP in the server’s Settings, and copy its Server API Token.
Setup guide: Custom SMTP connectionsPair it with a fallback
Postmark is itself a popular fallback for mailbox providers such as Gmail or Microsoft 365. As a primary, pair it with Amazon SES or SendGrid.
When Postmark refuses a message, BooleanSMTP tries your fallback connection at once, logs which one delivered it, and alerts you on Slack, Discord or Telegram only if every attempt fails. See the whole path
What Postmark receives
Only what sending needs: each message (recipients, subject, body, headers, attachments) and the credentials you enter for the connection, sent to Postmark when WordPress sends an email. BooleanSMTP stores those credentials encrypted in your own database. Read Postmark’s terms and privacy policy.