As requested, I am posting my patch to sendmail that allows plus addressing to work properly between Sendmail and LMTP. We connect to our LMTP via TCP in the sendmail configuration and I have never been able to get +addressing to work at all. I usually get a "user unknown" error, rejecting the e-mail.
Note: If you use the old "cyrus" mailer that calls "deliver" to deliver the e-mail, plus addressing works just fine there. You need to include the FEATURE(`preserve_local_plus_detail') line in the MC file, though.
Anyways, the patch code is only enabled if you include the '&' flag in the cyrus mailer definition. Once enabled, when sendmail determines if the user is valid, it will stop at the '+' character in the username portion of the e-mail address. Also, sendmail typically lowercases the username, so again, it will stop at the '+' when doing the lowercasing. This allows the folder names to have their casing preserved.
For testing purposes, I created "test1", "test box1", "Test2", and "Test Box2" folders and added "anyone: post" ACLs on all of them. I then used the following e-mail addresses to test:
[EMAIL PROTECTED] user+test\ [EMAIL PROTECTED] [EMAIL PROTECTED] user+Test\ [EMAIL PROTECTED]
The only reason I said anything about how I tested is that it isn't common knowledge about how to test with mailboxes containing spaces in them. So, there you have it.
I have submitted the patch to sendmail, so maybe it will get into the next version... who knows... The patch applies to sendmail-8.13.0. I had to change the flag I was using to an '&'. My previous version was using 'W', which now appears to be in use already in 8.13.0. Ah well.
Thanks,
Scott
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Scott W. Adkins http://www.cns.ohiou.edu/~sadkins/
UNIX Systems Engineer mailto:[EMAIL PROTECTED]
ICQ 7626282 Work (740)593-9478 Fax (740)593-1944
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lmtp-8.13.0.patch
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