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Request #63 Reduce subscription confirmation address length to fit RFC 5321
Submitted: 2016-10-17 01:52 UTC Modified: -
From: mgorny at gentoo dot org Assigned:
Status: Open
Mlmmj Version: 1.3.0 a/b/rc OS: Gentoo Linux
MTA: postfix MTA Version: 3.1.0
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 [2016-10-17 01:52 UTC] mgorny at gentoo dot org 
Description:
------------
Requested in http://mlmmj.org/archive/mlmmj/2016-10/0000002.html.

TL;DR: the local part of mailing list subscription confirmation addresses 
formed of:

  mailing-list-name "+confsub-" 16-random-hex "-" sender-address

can get very long, especially if sender-address is long. However, RFC limits it 
at 64 characters.

So I'm suggesting to drop the sender-address part from this address, since it 
is stored in the related file anyway and the atomic file creation secures the 
random from collisions anyway.