in a shared environment default value "smtp_tls_security_level=may" is may. but we have 3 domains that want to send out only tls secured mails. is it possible to select some of outgoing domains use only "smtp_tls_security_level=encrypt" but the others remains as it is now.

how can I set it up? Unfortunately I could not see anything on the documentation.

  • I didn't use Postfix for long time, so cannot provide exact answer. You could configure an additional smtp agent in master.cf, for example smtps, set its option as -o smtp_tls_security_level=encrypt or maybe -o smtps_tls_security_level=encrypt, and direct mail from your 3 domains to be sent out through the smtps agent – Sergey Nudnov Jun 14 at 18:08

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