> >> recipient_delimiter
> 
> It is an amavisd variable (at least, it lives in amavisd.conf).  It's
> used to add a delimiter to the email address when mail is flagged as
> spam (or a bad header), such as user+s...@example.com, or
> user+b...@example.com
> 
> Useful to get the mail to deliver to subfolders automatically. In
> this case it makes spam auto filter into the Spam folder in each
> user's IMAP folders.
> 
> I can turn it off completely, but then I'm losing a major chunk of
> functionality.
>
> [...]
> It just causes a new problem, because mail going to domainB doesn't
> support recipient_delimiters, and so bounces the mail as
> undeliverable (as user+s...@example.com doesn't exist - go MSFT).

Adding address extension can be selective - based on a recipient
e-mail address or his domain.

Set it to undef for your local domains which can't handle extensions
and let the rest have a non-empty default:

@addr_extension_spam_maps = ({
  '.my1.example.com' => undef,
  '.my2.example.com' => undef,
  '.' => 'spam',
});

or the other way around, let the default be none and list
your local domains which want added extensions:

@addr_extension_spam_maps = ({
  '.my1.example.com' => 'spam',
  '.my2.example.com' => 'junk',
  '.'  => undef,
});


  Mark

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