HI At first is it Exch. 5.5 or 2000? I assume your provider does not support MAIL RELAY because of junk MAIL. Why don't you use a SMTP server to forward your E-MAILS to your provider. In 5.5 you need an Internet MAIL connector, in 2000 its calledSMTP connector. This is a solution for sending MAILS. Let me know more details.
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Exchange Relay Servers
Due to the fact we are a dynamic server i have been experiencing problems relating to blacklisted ips...
Is there any way around this problem other than getting a fixed IP?
I was thinking that there may be a company which relays other companies mail.
Unfortunately my ISP does not support this and will not allow it for some reasons unknown to me.