Messages sent to alias+detail end up in INBOX

[ml at shadrinden.ru]

On Thu, 18 Feb 2021 14:57:19 -0500
Daryl Richards <daryl at isletech.net> wrote:

> 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...

On my machine it is by default set to

propagate_unmatched_extensions = canonical, virtual

According to man pages, the behavior of these values (canonical and virtual) in this regard seems to be identical:

"      When a mail address localpart contains the optional recipient delimiter
       (e.g.,  user+foo at domain),  the  lookup  order becomes: user+foo at domain,
       user at domain, user+foo, user, and @domain."

--
Respectfully,
Denis Shadrin