mailcow/data/conf/postfix
dofl d5eeb3e8af
Update main.cf
I was looking into creating a backup mx server for a high availability mailcow setup. It seems that this is not easily done. While researching to find out how long an average SMTP server keeps trying to send to a server that is down I found that RFC 5321 advises at least 4 to 5 days. Mailcow has a custom setup of 1 day, which is very short. The user will be unaware for 5 days that his mail has not been delivered, which can be negative. But I still would like to follow the advice of the RFC.

RFC 5321, in section 4.5.4.1, has this to say:
Retries continue until the message is transmitted or the sender  up;  the give-up time generally needs to be at least 4-5 days.  It MAY be appropriate to set a shorter maximum number of retries for non-delivery notifications and equivalent error messages than for standard messages. 

Postfix default is also 5 days: http://www.postfix.org/postconf.5.html

https://tools.ietf.org/html/rfc5321#section-4.5.4
2019-06-08 15:10:46 +02:00
..
allow_mailcow_local.regexp [Postfix] Add missing regexp map, fixes #2083 2018-12-11 17:16:53 +01:00
anonymize_headers.pcre [Postfix] Remove authed user from header 2019-06-01 22:14:48 +02:00
local_transport [Postfix] Mandatory protocol for authenticated clients over 587/tcp and 465/tcp is now TLSv1.0+ (reverts previous protocol change for authenticated users only) 2019-03-06 15:09:28 +01:00
main.cf Update main.cf 2019-06-08 15:10:46 +02:00
master.cf [Postfix] Mandatory protocol for authenticated clients over 587/tcp and 465/tcp is now TLSv1.0+ (reverts previous protocol change for authenticated users only) 2019-03-06 15:09:28 +01:00
postscreen_access.cidr Docs 2017-03-02 11:23:23 +01:00
smtp_dsn_filter mailcow dockerized 2016-12-09 20:39:02 +01:00