postfix mail server problems

[VWporsche]

well.. im pretty new to linux. i used it about a year ago for a short time, but i recently came back to start a web site. got everything up and running, and the web site works, but now my problem is e-mail. i set up postfix, and i can send mail and everything (with kmail), but the main problem lies somewhere else. i set up a forum on my web page, and the only way to get your password is through e-mail. well, for some reason my e-mail does not get delivered to 'aol.com' accounts, and is listed as 'Bulk mail" or 'spam' on almost every other e-mail service. im not interested in recieving mail with the service, just purely sending via the forum registration.
using mandrake 9.2, w/ w/e postfix comes stock. please point me in the right direction, or give me some guidance. any help is GREATLY appreciated.

[Gertrude]

Does reverse DNS work? I have a fealing that may be why AOL is filtering it out, and yahoo marks it as "bulk". You may want to check out the mail headers on the email.

[VWporsche]

your really going to have to explain to me what that is. i have absolutely NO idea, and from the searching i've been doing, theres very little documentation on it. sorry, but like i said.. this is the first time im setting up an e-mail server.

[VWporsche]

bump, i need some help.

[Gertrude]

To check reverse DNS first do a nslookup on you domain name.

For example on www.yahoo.com



Name: yahoo.com
Address: 66.218.71.198



Then check the DNS records on your IP address, and make sure it resolves back to your domain name, In Yahoo's case you would do a 'nslookup 66.218.71.198'..



ns4.yahoo.com internet address = 63.250.206.138
ns5.yahoo.com internet address = 216.109.116.17


As you see it returns back to yahoo.com..

[Gertrude]

Here are a few links...


http://searchcio.techtarget.com/sDefinition/0,,sid19_gci917504,00.html

http://www.dnsstuff.com/info/revdns.htm


From AOL's website..

http://postmaster.info.aol.com/guidelines/standards.html

AOL's mail servers will reject connections from any IP address that does not have reverse DNS (a PTR record).