Apple mail works but thunderbird unable to connect

[Bernardo Reino]

On 22/06/2020 18:19, Dshah wrote:

> I am stuck on this issue for days, I am able to connect on my IMAP 
> server using Apple mail client but thunderbird shows me this error: 
> "improper command pipelining after EHLO"

The problem is, AFAIK, Thunderbird's autoconfiguration. It tries to 
detect your SMTP settings (note: SMTP, i.e. for mail sending, not for 
receiving, which would actually involve dovecot), but does it violating 
the protocol (does pipelining without waiting for confirmation).

https://bugzilla.mozilla.org/show_bug.cgi?id=832457

The bug is old and considered to be resolved. And nobody cares :(
If you use postfix a "workaround" is to temporarily disable postscreen, 
which IIRC is the one (rightly) complaining about the improper pipelining.

Cheers,
Bernardo Reino