Hi Patrick, hi all others,
This is *not* an MTA issue at all as soon as we discuss the IMAP user
logging in rather than the MTA delivering mail!
This has been discussed indeed several times already and every time it
came up, there were several people answering that they have no problem
with that all. Yet unfortunately, they weren't talking about what was
asked and what you need. (As long as I didn't get it wrong.)
It is crucial in this discussion to distingish between two things:
1. Teach the MTA (Exim, Postfix, doesn't really matter) that mail for
x@xxxxx has to go to fillinwhatyoulike / what@xxxxxxxxx Yes, this is a
no-brainer. So we discuss SMTP here, which isn't really a subject for
Cyrus IMAPd at all. And it's not what you're asking if I get it right.
2. In IMAP a user uses a name to identify himself against Cyrus IMAPd.
The respective data is flowing right from the MUA (not the MTA) to port
143. Note: No Exim / Postfix / qmail in the game.
Cyrus itself is indeed built on the assumtion that whatever name you use
to authenticate *is* the name of the mailbox you want to see.
It is impossible to use any tricks in the LDAP backend to solve this.
You will be able to make LDAP lookup the credentials for userb if he
logs into Cyrus as usera (if you do whatever mapping in LDAP) but this
will always result in a "no mailbox with that name error" as Cyrus IMAPd
will authenticate correctly, but look for the wrong mailbox name.
The only way to solve your (and my) problem will be a canon_user SASL
plugin, which does not yet exist.
Well, sort of ...
Howard Chu was so kind to write one which he provided to me as patch.
Due to a lack of time and maybe ability I was yet unable to make it work
for me. But I definitely trust him that when he says he had this working
for him, that the problem is with me and not with his code.
So in case you are ready to compile your stuff from source, I will
happliy share the patch with you and I would be extremely thankfull if
you could help me with some hints on how to properly install that.
Regards,
Torsten
Jorey Bump schrieb:
Patrick Kranz wrote:
Now I have a customer, who needs the scenario that the usernames for
Cyrus differ from the mailbox and mailaddress respectivly. For example
user1@xxxxxxxxxxxxxx should be able to login with the username
someOtherUsername. This need arises from an integration with other
software-packages. Is there any possibility to make this work?
Yes, this is no different from any other alias or virtual setup that
offers multiple addresses to individual users. You would handle this in
the MTA. For example, I use virtual_alias_maps with Postfix, and map all
addresses to the corresponding cyrus IMAP user:
abuse@xxxxxxxxxxx admin
admin@xxxxxxxxxxx admin
postmaster@xxxxxxxxxxx admin
bob@xxxxxxxxxxx bob
robert.smith@xxxxxxxxxxx bob
You can also use the aliases file and other approaches.
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Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki
List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
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