[Dovecot] Dovecot and Outlook Express "plaintext authentication not allowed..."

[Charles Marcus]

On 2012-04-17 5:16 AM, D Chen <dchenusa at yahoo.com> wrote:
> When tried to set up a new Outlook Express mail acct, the following error encountered:
>
>       Your IMAP server wishes to alert you to the following:
>       plaintext authentication not allowed without SSL/TLS, but your client did it anyway.

Ummm... hello? McFly? ;)

You need to configure SSL on Outlook Express (why on gods green earth 
you are using that is beyond me), as the error plainly says. Until you 
do this it doesn't matter what you enter for a username/password.

Also, you should be using SSL on port 993, because I'm fairly certain 
that Outlook Express doesn't support STARTTLS on port 143.

And off topic but in the same vein, for postfix/SMTP relay you should be 
using the submission port (STARTTLS on port 587) for most clients, but I 
think Outlook Express again doesn't work with it, so you will need to 
use the deprecated SSL on port 465 (these two need to be enabled in 
postfix/master.cf - just uncomment the examples).

-- 

Best regards,

Charles