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I have a Postfix server that is having issues receiving a distribution email from a customer mail server that has over 100+ recipients. I have increased debug information using debug_peer_level and debug_peer_list.

What I have found is that after the Postfix server receives 99-102 "RCPT TO:" SMTP commands, it closes the connection.

The logs don't really indicate exactly what Postfix is doing at that point and I have increased my debug_peer_level to 99 to make sure I'm not missing any additional information.

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up vote 1 down vote accepted

Increase the recipient limit with

smtp_destination_recipient_limit = 1024

Add this line to your and then, reload postfix.

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