Eudora, Dovecot, 20.04 LTS

[david]

At 08:40 AM 1/6/2021, David Fletcher wrote:
>On Wed, 2021-01-06 at 08:17 -0800, david wrote:
> > Folks
> >
> > I have installed Ubuntu 20.04.1 LTS with Postfix and Dovecot to
> > replace a server that was running Centos.  I also use Eudora 7 on my
> > Windows desktop as a mail client (yes, I know it's old, but it's
> > still the best).  Eudora works in centos 7 and 8, but does not work
> > in Unbutu (using TLS, Alternate Port).  The server log complains:
>
>Evolution on my Mint 20 desktop says it's talking to my Dovecot on my
>Ubuntu 20.04 server using IMAP / TLS on a dedicated port (993)

Yes, I know that the Ubuntu dovecot works because I ran a different 
mail client as a test and it worked perfectly.  I strongly suspect 
that Eudora is using some 'older' protocol which Dovecot on Centos 
allows but Dovecot on Ubuntu does not.  The version numbers of 
Dovecot are similar:

Ubuntu 20.04.1:  Dovecot 2.3.6.2
Centos8: Dovecot 2.3.8
Ubuntu 20.10: Dovecot 2.3.11

David