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I want to enable subaddressing (plus addressing, detail addressing, address extensions, whatever you want to call it) on my mail server. I've found a few guides but they have all related specifically to IMAP servers. Many of my users don't bother with POP or IMAP. (I still use mail occasionally myself.)
Unfortunately, I know very little about how subaddressing actually works. It seems like it could just be a matter of setting a postfix configuration option to allow subaddressing, postfix will then dump everything with the appropriate username portion in the appropriate mailbox, and then users' procmail rules can handle it from there.
Any information at this point would be helpful, as I am completely out to sea here and my usual peers all looked at me blankly when I asked about it.
recipient_delimiter (default: empty)
The separator between user names and address extensions (user+foo). See canonical(5), local(8), relocated(5) and virtual(5) for the effects this has on aliases, canonical, virtual, relocated and on .forward file lookups. Basically, the software tries user+foo and .forward+foo before trying user and .forward.
recipient_delimiter = +