On 14.06.22 16:57, Yves-Marie Le Pors Chauvel wrote:
Using Postfix 3.5.6, only one IP per postfix instance, I have an issue with
a specific Mailbox Provider limiting to 3 ingoing connections per IP.
==========================================================================#
service type private unpriv chroot wakeup maxproc command + args#
(yes) (yes) (yes) (never) (100)#
==========================================================================transport
unix - - y - 3 smtp*
...gmail interface sucks horribly with plaintext mails, it removes newlines.
however, I wouldn't call it "transport" but something like "smtp3" as you
want 3 connections max.
# Transport policy
transport_initial_destination_concurrency = 1
why?
see http://www.postfix.org/postconf.5.html#initial_destination_concurrency
Warning: with concurrency of 1, one bad message can be enough to block all mail to a site.
transport_destination_concurrency_limit = 3
this is the way
transport_destination_rate_delay = 0
that's the default
transport_destination_recipient_limit = 2
why?
*smtp_connection_cache_on_demand = yessmtp_tls_connection_reuse =
yessmtp_connection_reuse_time_limit = 300ssmtp_connection_reuse_count_limit
= 99smtp_connection_cache_time_limit = 2s*
you don't need these, you just need to feed mail to that mailbox provider
to the named "transport" (I repeat, change the name) via transport_maps:
.example.com transport:
Is there a way to implement a delay between connection closing and
reopening for a specific transport in Postfix, while still using connection
reuse ?
not needed, but if you happen to have big backlog, you may try:
smtp_connection_cache_destinations=.example.com
and perhaps increase timeout for the transport (my is named "slow"):
slow unix - - y - - smtp
-o syslog_name=postfix/$service_name
-o smtp_connection_cache_time_limit=30
I have solved similar problem 2 months ago, you can check here:
https://marc.info/?l=postfix-users&m=164926643409705&w=2
--
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