New answers tagged postfix
After you have installed the mail server using something like sudo apt-get install mailutils and created the aliases file, you need to let the system read and create a hash file of the aliases configuration. sudo newaliases Changing the aliases file without running the above command afterwards will not make any changes for the system. This post might be ...
Google compute engine does not allow sending email - but offfers a free relay service thru sendgrid: https://cloud.google.com/compute/docs/tutorials/sending-mail
While I could not get around the SASL issue ... for other modules that do not support SASL; PAM is used. I integrated PAM with LDAP (pam_ldap.so). If you have PAM also using LDAP successfully then you can avoid having to rely only on SASL. Not the desirable solution but an effective and logical workaround.
In a case I recently encountered, it was a Man In The Middle box put in place by a sender's hosting provider. It was programmed to inspect all port 25 traffic and if it saw a couple of strings from an old, expired Spamcop report, it would drop the connection at end of DATA, with the sender getting the "550 Action not taken" message. No other email from the ...
I suggest you to check this http://stackoverflow.com/questions/18318789/linux-postfix-dovecot-554-relay-access-denied smtpd_recipient_restrictions = permit_mynetworks permit_sasl_authenticated reject_unauth_destination
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