Centos 4.2, removing sendmail and installing postfix from yum
Change mycompany.hosting to your real domain name , and use that everywhere
instead of mycompany.hosting
for example if your domain name is bigcompany.com you will use bigcompany.com
everywhere in this guide instead of mycompany.hosting!!!!
!!! Read this !!!
If you used bigcompany.com for fqdn (mail.bigcompany.com) , you cannot use
the same domain name for virtual domains, since postfix will not work, this is
a critical error i made in this guide, sorry.
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