When I upgrade from 6.0.6_GA to 6.0.12_GA the first problem comes up again.

Someone can say what is the fisical difference (changed files) between the two release?

I've downgraded from 7 to 6.0.8

In this way the external mail works fine.

Now the question is: what's the difference in the two versions?

I've installed the Open Source version on Zimbra and I was going to set an external account on zimbra:Preferences:External account

When I insert the login parameters for a mailbox ( that works on...