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Mikhail T.
Asked: 2017-07-27 19:42:37 +0800 CST

How to make sendmail respect +-notation for virtual users?

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I have different forwarding needs for different domains, which all point to my mail-server:

[email protected]   [email protected]
[email protected]   [email protected]
@example.com        mylocalaccount

This all works... However, some of these users wish to use the +-notation to give different vendors different addresses, such as user1+vendor@example.com. And this part is not working -- all such e-mails end up delivered to the catchall mylocalaccount instead of being forwarded properly.

How do I make [email protected] be forwarded to the same destination as [email protected]?

I tried adding entries like

user1+*@example.com    foo+%[email protected]

but that didn't fix the problem...

Here are the debug-traces:

Without the detail:

% sendmail -d60.5 -bv [email protected]
map_lookup(dequote, me, %0=me) => NOT FOUND (0)
map_lookup(dequote, g, %0=g) => NOT FOUND (0)
map_lookup(virtuser, [email protected], %[email protected], %1=g) => [email protected] (0)

... works.

With the detail:

% sendmail -d60.5 -bv [email protected]
map_lookup(dequote, me, %0=me) => NOT FOUND (0)
map_lookup(dequote, g+meow, %0=g+meow) => NOT FOUND (0)
map_lookup(virtuser, [email protected], %[email protected], %1=g+meow) => NOT FOUND (0)
map_lookup(virtuser, @example.com, %[email protected], %1=g+meow) => me (0)
map_lookup(dequote, me, %0=me) => NOT FOUND (0)
map_lookup(user, me, %0=me) => me<> (0)
[email protected]... deliverable: mailer local, user me

... does not work -- comes to the catch-all local account "me".

sendmail

2 Answers

  1. If you want to virtusertable to redirect with +detail preserved then try:

    # use %2 if you want to strip EMPTY +detail ([email protected])
[email protected]   foo%[email protected]

    Debug procedure
    As root execute sendmail -d60.5 -bv [email protected].
    It should trace map lookups including virtusertable map lookups.
    Try sendmail -d21.12 -d60.5 -bv [email protected] if +detail is stripped before virtusertable lookups.

    [email protected] by default should make sendmail look for the following virtusertable enries:

    1. [email protected]
    2. [email protected]
    3. user+*@example.com
    4. [email protected]
    5. [email protected]
    6. +*@example.com
    7. @example.com

    [email protected] (plus present but detail empty) conducts lookups 1+3+4+6+7
    [email protected] (no +detail present) condutcs lookups 4+7

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  2. Best Answer

    It seems that + is missing in OperatorChars in your sendmail.cf. It makes R lines in sedmail.cf see one token user+detail instead of three tokens user + detail.

    sendmail.cf generated from sendmail.mc should set OperatorChars to .:%@!^/[]+ by default accoding to the bat book. It may be changed in mc file by defining confOPERATORS.

    Check what is reported by grep OperatorChars /etc/mail/sendmail.cf

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