Viktor Dukhovni:
> On Wed, Jan 11, 2023 at 03:57:28PM +0100, Patrick Ben Koetter wrote:
>
> > Today I ran into a lookup problem where a sender (!) was using the RFC 5233
> > subaddress schema so send a message e.g. as localpart+subaddress@domainpart
> > and lookups with smtpd_sender_login_maps failed because I was unable to come
> > up with a LDAP query_filter that would look for localpart@domainpart a ka
> > strip the subaddress.
>
> http://www.postfix.org/postconf.5.html#recipient_delimiter
>
> The documentation isn't clear on whether extensions are handled in
>
> http://www.postfix.org/postconf.5.html#smtpd_sender_login_maps
>
> but they are. You shouldn't need any LDAP-specific support here,
> Postfix will automatically generate a query with the extension elided.
The doc should include this text from virtual(5), canonical(5), etc.,
which use a similar lookup stratgy.
ADDRESS EXTENSION
When a mail address localpart contains the optional recipient delimiter
(e.g., user+foo@domain), the lookup order becomes: user+foo@domain,
user@domain, user+foo, user, and @domain.
Wietse
