[Dovecot] Struggle with Postfix/Dovecot-auth and SASL

[Justin McAleer]

Ingo Reimann wrote:
> Hi List,
>
> I just updated an old sendmail installation to a modern postfix/dovecot system with mysql backend. Everything works fine but SMTP-AUTH fails with some clients.
>
> The problem is, that with PLAIN (old) clients send the base64 coded form: USERNAME\0USERNAME\0PASSWORD which, as i understand dovecot interprets as MASTERUSER\0USERNAME\PASSWORD. New clients send \0USERNAME\0PASSWORD which works fine. I don`t like to use masterusers, because then everyone would be able to log in as someone else. 
>
>   
What clients have you found that show this behavior? I'm setting up a 
Postfix server in this manner myself. Although, since this server is 
outbound only (dovecot does nothing but auth for smtp), I guess I could 
work around it by setting up the master user stuff.
> When i don`t have a passdb with master=yes in my dovecot.conf, Dovecot complains
> auth(default): passdb(XXXX at YYY.TLD,master): Attempted master login with no master passdbs
>
> If i create a passdb with contains everyone, everyone may look into other mailboxes. No good idea.
>
> I can`t change the old clients, but for now, i don`t know, what i am doing wrong or how to correct it. No real HowTo for my setup on the net, it seems that everyone uses cyrus-sasl.
>
> May anybody help, because i don`t like to switch my setup or use 2 auth daemons.
>
> My System:
> Debian Etch, postfix (2.3.7-3), dovecot (1.0.rc15-2)
>
> Best wishes,
>
> Ingo Reimann
> System Manager 
>
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