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I'm using Swiftmailer with php to send emails over my Postfix server. It works fine. But also works without verifying the credentials specified on php. How can I verify in Postfix if those credentials are correct and then allow the mail sending?


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You should set up a dedicated submission listener on postfix that only allows authenticated submission.

Refer to the commented-out example in, and swicth submitting applications to port 587.

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