Dear team, we enabled smtpd_forbid_unauth_pipelining in our Postfix, but unfortunately it still accepts \n.\n (<LF>.<LF>) as EOD. This is our configuration in main.cf:
smtpd_forbid_unauth_pipelining = yes smtpd_discard_ehlo_keywords = pipelining Here is an example of two emails being pipelined with <LF>.<LF>: ( printf 'ehlo example.com' printf '\r\n' printf 'mail FROM: us...@example.com\r\n' printf 'rcpt TO: us...@receiver.com\r\n' printf 'data\r\n' printf 'From: header1@sender\r\n' printf 'To: header1@receiver\r\n' printf 'Subject: SUBJECT #1\r\n' printf '\r\n' printf 'MESSAGE 1\n.\n' printf 'mail FROM: admin@sender\r\n' printf 'rcpt to: targ...@receiver.com\r\n' printf 'DATA\r\n' printf 'From: header2@sender\r\n' printf 'To: targ...@receiver.com\r\n' printf 'Subject: SUBJECT #2\r\n' printf 'MESSAGE2\r\n.\r\n' ) | netcat server.example Postfix output: 220 dev1.example.dev ESMTP Postfix 250-dev1.example.dev 250-PIPELINING 250-SIZE 52428800 250-VRFY 250-ETRN 250-STARTTLS 250-ENHANCEDSTATUSCODES 250-8BITMIME 250-DSN 250-SMTPUTF8 250 CHUNKING 250 2.1.0 Ok 250 2.1.5 Ok 354 End data with <CR><LF>.<CR><LF> 250 2.0.0 Ok: queued as 7E8857D1B7 250 2.1.0 Ok 250 2.1.5 Ok 354 End data with <CR><LF>.<CR><LF> 250 2.0.0 Ok: queued as 8017A818F4 We are running: mail_version = 3.8.3 Do you have other recommendations on what actions could be taken? Thanks and regards Till Wigger
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