Configure server for only sending mails

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http://nixcraft.com – Hi, i have a server that uses sendmail to work with php mail .But MX records for this domain is pointed to an another server.Mails are working when i send mails from this server, but it goes to spam folders on gmail,yahoo etc.I have added a PTR record to resolve to the website name from which i sendmails,still not working.Is it possible to use this server just for sending mails and make it work with gmail, yahoo etc. Thank you (HowTos)