On 2021-02-18 2:46 p.m., m...@shadrinden.ru wrote:

On Thu, 18 Feb 2021 14:36:01 -0500
Daryl Richards <da...@isletech.net> wrote:

Just to ask - when you say 'alias' do you mean something is
re-writing the address based on some rule? If so, it sounds to me
like that is dropping the +detail...

I mean the aliases defined in /etc/aliases, like

jane:   joe

Do you have propagate_unmatched_extensions turned on?

http://www.postfix.org/aliases.5.html shows that has to be on otherwise it could drop the +detail part...

--
Daryl Richards
Isle Technical Services Inc.

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