[HowTo] Replace courier with dovecot

[NoFutureKid]

perhaps i did something wrong, but after installing dovecot, all my Outlook Clients didn't work anymore.

First thing i've found: most Outlooks, especially Outlook Express don't send a full qualified domainname and therefore are not able to send mails. (Postfix problem)

Second: Outlook prior to Outlook 2007 need also a modification on the dovecot.conf ->

mechanisms = plain login digest-md5