Shirley Comcast will allow you to relay your outbound mail through their MXed, reverse-DNSed mailhost, right? If so, just point your Exchange server to relay all outbound mail through them.
If not, ditch Comcast. They're not a business-class ISP in my opinion, at least. -- be - MOS Replace repetitive expressions by calls to a common function. > -----Original Message----- > From: Crista Murphy [mailto:[EMAIL PROTECTED] > Sent: Wednesday, January 07, 2004 8:51 AM > To: Exchange Discussions > Subject: Re: Internet Mail Issues > > > 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? > > _________________________________________________________________ > List posting FAQ: http://www.swinc.com/resource/exch_faq.htm > Web Interface: http://intm-dl.sparklist.com/cgi-bin/lyris.pl?enter=exchange&text_mode=&; lang=english To unsubscribe: mailto:[EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED] To unsubscribe via postal mail, please contact us at: Jupitermedia Corp. Attn: Discussion List Management 475 Park Avenue South New York, NY 10016 Please include the email address which you have been contacted with. _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Web Interface: http://intm-dl.sparklist.com/cgi-bin/lyris.pl?enter=exchange&text_mode=&lang=english To unsubscribe: mailto:[EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED] To unsubscribe via postal mail, please contact us at: Jupitermedia Corp. Attn: Discussion List Management 475 Park Avenue South New York, NY 10016 Please include the email address which you have been contacted with.
