Hotmail blocking emails from iMS5.2 relay server???

Hi all, lately we have started experiencing problems sending emails from our iMS5.2 environment to hotmail.
In our iMS5.2 environment, we have two mail relays/gateways. Today I tried manually sending emails to hotmail using telnet. I found that I was able to send an email from one gateway (gw2) but not the other (gw1). On the mail gateway that I can't send an email, gw1, using telnet, I get the following error:
550 Your e-mail was rejected for policy reasons on this gateway. Reasons for rejection may be related to content such as obscene language, graphics, or spam-like characteristics (or) other reputation problems. For sender troubleshooting information, please go to http://postmaster.msn.com. Please note: if you are an end-user please contact your E-mail/Internet Service Provider for assistance.
A search on Google reveals this blocking is quite common with hotmail.
Emails sent to yahoo, gmail work fine.
Am I right is thinking that hotmail is blocking emails that originate from iMS5.2 mail gateway gw1? And if so, what can be done to remedy the situation?
Thanks in advance,
Stewart

This isn't so much a iMS5.2 question as a simple SMTP Host question. HotMail is likely blocking your site by IP address. You could change the IP address of the host, but this might be a symptom to a larger problem of abuse.
My advice is to go through the mail.log files to identify when those emails were originally sent to Hotmail. It might reveal a potential problem which might be an internal spammer.

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