SMTP Auth - Ldap server

[Tomàs Núñez Lirola <tomas@asertel.es>]

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Hi
I'm trying to SMTP Auth, but the incoming mail server and the outgoing mail 
server are two different machines, that is, if I want the pop pass and the 
smtp pass to be the same, I need to sync the two passwd files. Mantaining the 
two different passwd files on the machines could lead to inconsistency, so 
I've thought the only way is installing a Ldap server.

Do you know any other way to share passwd?
Do you know a howto to auth pop3 and smtp with ldap?
And a howto transfer the passwd file to a ldap server?

Thanks :)
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