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Mail server recommendations

Hello,
could you please recommend me a book which covers SMTP Server installation, spam filtering, etc.?
Additionally, I found that MTA agents comparison (Exim4 vs Postfix) was not discussed, does it mean in modern Linux installations sysadmin should prefer Postfix,
Thank you in advance!
0
Comments
There are a few books on postfix, some with very good reviews. The postfix web site has a large selection of documentation at http://www.postfix.org/documentation.html , including some basic setup guides.
Exim and Postfix are both very good MTA's and starting a flame war is not my intention.
Postfix seems to the popular default as it is in the primary or base repository and exim is in the extras or add-on repository. Both MTA's are available on most distributions and have reasonable default configuration files.
The challenge in making a recommendation is each site has a different use cases that could alter the choice of MTA, for our classroom we chose postfix for ease of configuration, security and it is the default at installation time.
Lee