On Dec 16, 2008, at 3:10 AM, Gopinath Achari wrote: > Hi All, > > I want to set up a sendmail server on Centos 5.2 Pc. This server > should be > able to send and receive mails outbound. i have purchased a domain > name. can > you help on this. The classic outline is here: http://www.sendmail.org/tips/virtualHosting Other things that you will want to do: Make sure that your server uses a valid domain name in the HELO/EHLO. Make sure that the valid domain name maps back to the IP address of your server. Make sure that the PTR record for your IP address matches your valid domain name. Otherwise you'll find that people will defer and/or reject your emails. If you cannot get your config set up like this, then you will probably want to relay your email via your upstream ISP's smarthost. --Chris