Hi, I have been researching my problem, and apparently its a common problem with ubuntu 11.10.

Its something to do with saslauthd and how the users authenticate against the SMTP server. I am not very familiar with lniux mail servers as the mail server I am using has replaced a windows hmailserver.

I find it strange tho that squirrelMail will work and not external connections.

When a external device attempts to authenticate with postfix:

SASL LOGIN authentication failed: no mechanism available
Is entered into /var/log/mail.log.

I have tried this fix and it doesn't seem to work for me.

Any suggestions?

Many Thanks Dan