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I got a new server with a new IP address. Apparently this IP is listed in the hotmail blacklists so that I can't send mails to hotmail users out of my webapplication.

postfix/smtp[24706]: 8F31C9404B: to=<xxx@hotmail.com>, relay=mx3.hotmail.com[65.55.37.88]:25, delay=0.66, delays=0.01/0/0.48/0.16, dsn=5.0.0, status=bounced (host mx3.hotmail.com[65.55.37.88] said: 550 SC-001 Unfortunately, messages from 78.47.228.xxx weren't sent. Please contact your Internet service provider since part of their network is on our block list. You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors. (in reply to MAIL FROM command))

My hoster will not help me get that address removed from the blacklist. So I tried to find a way to do it on my own, but I can't find a way to ask Microsoft to remove my IP from that list.

Has anyone managed to remove a falsely listed address? And if yes: how?

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You should ask your hoster to give you a new IP address, coz you didn't do anything to get the IP blacklisted in the first place. – rzlines Mar 19 '11 at 10:06
Getting a new IP is what my hoster offered me. Problem with that is, that it practically means a 24h downtime to get all the DNS updated. – Kai Mar 19 '11 at 11:29
Can you: get a second address, update DNS, then remove the old one? – grawity Mar 19 '11 at 15:39
550 SC-001 "Reasons for rejection may be related to content with spam-like characteristics or IP/domain reputation." Maybe you need another Hoster if it is due to their bad reputation, or are you spamming?....mail.live.com/mail/troubleshooting.aspx#errors. – Moab Mar 19 '11 at 17:20
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closed as off topic by kez, studiohack♦ Mar 19 '11 at 17:46

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1 Answer

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Easiest way is to send the email out via your ISP's mail server instead. Most hosting companies will provide a mail relay facility.

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I'm not sure if this applies to VPS/dedicated hosting companies. AFAIK, most of them will just tell you to install a MTA on your own server (which is what Kai did). – grawity Mar 19 '11 at 15:40
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