Same mailbox with different logins

Scott Lambert lambert at
Fri Sep 18 19:06:52 EDT 2009

On Fri, Sep 18, 2009 at 11:24:08PM +1000, Bron Gondwana wrote:
> On Fri, Sep 18, 2009 at 03:43:20PM +0300, Evgeniy Arbatov wrote:
> > Hello,
> > 
> > A question: I want users authenticating with two different usernames
> > to Cyrus IMAP to be able to access the same mailbox.
> > 
> > For example, I wish this to be the case ("login name" -> "mailbox"):
> > 
> > username -> user/firstname.lastname at domain
> > firstname.lastname at domain ->  user/firstname.lastname at domain
> > 
> > What would be the way to proceed?
> Well - we just put an nginx proxy in front, and have the authentication
> daemon return the "correct" username to pass to the backend, regardless
> of the username used.  That's one option.
> What's the use case anyway?  You can use aliases for delivery, why does
> the one user need two different usernames?

I don't know about the original poster but the ISP I work for has been
doing e-mail with sendmail and IMAP-UW.

All usernames are of the form username at maindomain, only they don't use

Customer domain users use mailboxes of the form
domainSpecificPrefixOf2or3characters_localpart for
localpart at customerdomain.

localpart at	cd_localpart

We would like to get those users out of the maindomain and have them
switch to using mailboxes of localpart at and be able
to login as localpart at but have compatibility with
the old way of loging in as cd_localpart as well, at least during the
transition period. 

But we haven't gotten to giving that a lot of thought yet.

Scott Lambert                    KC5MLE                       Unix SysAdmin
lambert at

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