I have been having an intermittent problem sending to gmail. For some
reason the problem only seems to affect IPv6 connections.
I get the following error message:
<zzz2...@gmail.com>: host gmail-smtp-in.l.google.com[2607:f8b0:400d:c01::1b]
said: 550-5.7.1 [2001:dead:beef:10::182 16] Our system has detected
that this 550-5.7.1 message does not meet IPv6 sending guidelines regarding
PTR records 550-5.7.1 and authentication. Please review 550 5.7.1
https://support.google.com/mail/answer/81126 for more information.
a1si5706259qez.81 - gsmtp (in reply to end of DATA command)
I think I understand the problem;
My server has multiple functions and uses, for various reasons, multiple IP
addresses.
Postfix cycles through these when sending mail to out. Postfix is supposed to
be using ....::178.
Because of this a reverse look up does not return the correct info for my
server.
Google, quite rightly objects and bounces my mail.
From reading the Postfix documentation I think that I need to add the following
to my master.cf/
smtp unix - - n - - smtp
-o smtp_bind_address=n.n.n.178
-o smtp_bind_address6=2001:dead:beef:10::178
/This seems to have solved the problem. However, is there anything else that I
should or could add, that might avoid similar problems in the future/?//
/Are then any gotcha that I should be aware of/?/
/postconf -Mfvx//
//
//smtp inet n - n - - smtpd//
// -o cleanup_service_name=pre-cleanup//
//pickup fifo n - n 60 1 pickup//
// -o cleanup_service_name=pre-cleanup//
//submission inet n - n - 30 smtpd//
// -o syslog_name=postfix/submission -o smtpd_tls_security_level=encrypt//
// -o smtpd_sasl_auth_enable=yes -o smtpd_client_connection_count_limit=15//
// -o smtpd_client_connection_rate_limit=80 -o smtpd_delay_reject=yes//
// -o smtpd_recipient_restrictions=permit_sasl_authenticated,reject//
// -o cleanup_service_name=pre-cleanup//
//qmgr fifo n - n 300 1 qmgr//
//tlsmgr unix - - n 1000? 1 tlsmgr//
//rewrite unix - - n - - trivial-rewrite//
//bounce unix - - n - 0 bounce//
//defer unix - - n - 0 bounce//
//trace unix - - n - 0 bounce//
//verify unix - - n - 1 verify//
//flush unix n - n 1000? 0 flush//
//proxymap unix - - n - - proxymap//
//proxywrite unix - - n - 1 proxymap//
//smtp unix - - n - - smtp//
// -o smtp_bind_address=74.116.186.178//
// -o smtp_bind_address6=2001:470:b183:10::178//
//relay unix - - n - - smtp//
//showq unix n - n - - showq//
//error unix - - n - - error//
//retry unix - - n - - error//
//discard unix - - n - - discard//
//local unix - n n - - local//
//virtual unix - n n - - virtual//
//lmtp unix - - n - - lmtp//
//anvil unix - - n - 1 anvil//
//scache unix - - n - 1 scache//
//smtp-amavis unix - - n - 4 smtp//
// -o smtp_data_done_timeout=1200 -o smtp_send_xforward_command=yes//
// -o disable_dns_lookups=yes -o smtp_tls_note_starttls_offer=no -o
max_use=20//
//127.0.0.1:10025 inet n - n - - smtpd//
// -o content_filter= -o smtpd_delay_reject=no//
// -o smtpd_client_restrictions=permit_mynetworks,reject//
// -o smtpd_helo_restrictions= -o smtpd_sender_restrictions=//
// -o smtpd_recipient_restrictions=permit_mynetworks,reject//
// -o smtpd_data_restrictions=reject_unauth_pipelining//
// -o smtpd_end_of_data_restrictions= -o smtpd_restriction_classes=//
// -o mynetworks=127.0.0.0/8 -o smtpd_error_sleep_time=0//
// -o smtpd_soft_error_limit=1001 -o smtpd_hard_error_limit=1000//
// -o smtpd_client_connection_count_limit=0//
// -o smtpd_client_connection_rate_limit=0 -o
local_header_rewrite_clients=//
// -o local_recipient_maps=//
// -o
receive_override_options=no_header_body_checks,no_unknown_recipient_checks,no_milters//
// -o smtpd_tls_security_level=none -o local_recipient_maps=//
// -o relay_recipient_maps=//
//pre-cleanup unix n - n - 0 cleanup//
// -o virtual_alias_maps=//
//cleanup unix n - n - 0 cleanup//
// -o mime_header_checks= -o nested_header_checks= -o header_checks=//
// -o body_checks=//
/
//
