Hosted Email Server can not send emails to certain domains including Hotmai

I host my own email server and domain, but when I try to send emails to certain domains Hotmail being one of them, It gets refused saying something about spamming, when I know I am not a spammer because only one of the users in my domain can actually send and receive emails.
Is there a list I can include my domain in, so that I can bypass the spammer status?
Any help is greatly appreciated it.
Thanks!

This is getting common as people attempt to cut down the spam.
Check your reverse dns is correct, I'd suggest an external test like http://www.mxtoolbox.com/ against your system/domain is a good place to start.
In the case of the problems I had at home a while back this was down to my ISP not setting up the reverse DNS correctly. I got the Reverse DNS not matching the SMTP Banner i.e. IP address then ISP name:-
xxx.xxx.xxx.xxx.btopenworld.com
Microsoft and some other companies introduced a while back the use of SPF records, so check your zone file info to make sure this is there and valid.
http://old.openspf.org/index.html will help here, if you haven't got SPF set-up.
Some ISP's employ Goodmail systems, now which isn't a problem for small companies/home users sending small amounts of email, but will effect large companies.
If you're not sending large amounts of email to AOL, Hotmail, Yahoo etc this shouldn't effect you. Basically, it will force a 'drip feed' into their email systems. One company I worked at had to send email to customers, and this meant the first few emails would be accepted, then the server wouldn't accept more email for 20 minutes or so, then it would take another 5 emails, and so on....
Dynamic IP addresses, from your ISP can also cause huge problems. If you haven't got a fixed IP address, many systems will reject email. Even if you have a static IP address, ensure your ISP has this correctly allocated. Sometimes, you'll get it from the wrong range (ones which normally are Dynamic), and this will cause problems. 'Cheap state' ISP's can often allocate you a fixed IP, but because they have 'run out' of fixed addresses, they may pinch a dynamic one....
Some places check your MX records http://vger.kernel.org/mxverify.html will help here. It's a bit of a cheat, as large companies may not have the same outbound servers as inbound servers, but I have seen this cause problems when ALL the mail servers are not listed in the MX records.
The only one I wouldn't worry about too much is the Goodmail system, unless you're sending large amounts of email. But even then, they normally only slow email delivery down and not actually reject it.

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