I have a client who is migrating away from an ISP hosted POP mail account to a newly created exch 2003 box and we're experiencing "5.5.0 smtp;550 Dynamic IPs/open relays blocked. Contact <[EMAIL PROTECTED]", "5.5.0 smtp;550-68.37.144.103 blocked by blacklist.mail.ops.asp.att.net." and to aol "Could not deliver the message in the time limit specified." I've contacted both earthlink and att/comcast and both insist that the new server is not blacklisted and a quick search on ORDB shows we are not blacklisted (The server had only been up 4 hours and we were getting this message from att/comcast!) I've locked down the server and we're not allowing relay so I'm thinking it might be reverse dns, but comcast (our isp) won't allow us to host reverse dns or set up an entry for us. Before we shutdown the server and get an new ISP that will allow reverse dns, does anyone else have an idea?
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