[Dovecot] Disconnected: Too many invalid IMAP commands

[Gabriele]

I was never meant to start a flame, so forgive me if I didn't observe 
the list guidelines.

The issue is solved now, it was a simple firewall (anti-malware setting) 
issue…

This runs against distro vs distro arguments, version vs version, etc.

Before writing to this list I already Googled, contacted a couple of 
Ubuntu forums, a couple of independent lists, to no avail. I either had 
no reply, or have been told to upgrade, to change distro, to compile vs 
using binaries, to switch to gentoo, etc. etc.

"old stable" isn't always cause of issues, in general, although I might 
agree with many of your statements and observations.

Thanks for your time, guys! :-)
Gabriele