Re: Exim4U and Debian

Karl Scalet wrote:
> I did not even figure out, what exactly DKIM is?

DKIM stands for DomainKeysIdentified Mail and its simply a way for a 
mail server to sign its outgoing mail such that the signature can be 
verified by the receiving server.  In other words, its a way for a 
sending server to authenticate its mail so that receiving servers may 
subsequently verify the mail's authenticity. DKIM is similar to SPF in 
that regard. The DKIM website is:

http://dkim.org/

DKIM is actually based on DomainKeys which was developed by Yahoo.  
DomainKeys is now depricated in favor of DKIM which is why Exim has now 
dropped DomainKeys entirely with their implementation of DKIM.

The primary advantage to using DKIM (and/or DomainKeys) is that the 
larger ISPs, such as Yahoo, gmail, etc., are less likely to put mail 
from your server into their spam folders if you use DKIM.  Also, some of 
the large ISPs, especially Yahoo, greylists alot of incoming mail that 
they regard as suspicious and they are less likely to grey list mail 
with DKIM signatures.  Another advantage to DKIM is that you can 
greylist and/or reject mail by verifying incoming DKIM signatures.

DKIM signing and verification are included with Exim4U. Instructions are 
provided which allows you to chose what to do when a DKIM signature 
fails with your choices being to reject, greylist or do nothing.

FYI,

Gordon