Custom SMTP
Point PostFrame at any server that speaks SMTP — Postfix, Exchange, a hosted relay — with STARTTLS on 587 or TLS on 465. Link and open tracking still work, because PostFrame rewrites the message before it hands it over.
Why Custom SMTP
Common questions, straight answers.
What details does a custom SMTP connection need?
Host, port, username and password. Port 465 uses implicit TLS; other ports use STARTTLS. PostFrame stores the credentials in its secrets vault.
Does tracking still work through my own SMTP server?
Yes. PostFrame rewrites links into tracked redirects and adds the open pixel before the message is handed to your server, so opens and clicks report exactly as they do on any other provider.
Can software that only speaks SMTP send through PostFrame?
Yes. PostFrame also runs an SMTP relay that authenticates with your API key and queues the message through the normal send pipeline, so legacy tools get the same templates, tracking and suppression checks as the API.
What happens when this provider returns an error?
The send moves to your next provider by priority on the same request, up to three attempts. After five failures inside five minutes the provider's circuit opens and it is skipped for sixty seconds before being tried again.
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