You must add a Sender Signature for individual email addresses or verify an entire Domain to send from any address on that domain. This ensures you own the mailboxes and helps prevent spam.
introducing Layouts for reusable components in Templates - Postmark postmark
: In Postmark, "Servers" are folders to organize different projects or environments (e.g., Development vs. Production). Each server has its own API Token . Integration Methods API (Recommended) You must add a Sender Signature for individual