Could I deliver one server email through another server?
Hello, I am having trouble delivering email to hotmail from one server that was reported as spam source yesterday.
We have removed the offending account and placed a request to msn support to remove any block on our IP address but still have not answer to our request since almost 24 hours. Still keep receiving the same answer:
550 SC-001 Mail rejected by Windows Live Hotmail for policy reasons. Reasons for rejection may be related to content with spam-like characteristics or IP/domain reputation problems. If you are not an email/network admin please contact your E-mail/Internet Service Provider for help. Email/network admins, please visit http://postmaster.live.com for email delivery information and support
Is it possible to route my server email though another machine at least while the ip address is kept blocked? I mean may I use any firewall rule to move all port 25 trafic to a clean server to avoid the delivery problems?
I have 100 customers who can't communicate with its partners due this problem.
What mail server are you using? Does your server have any control panel? By default the server main IP is used as the mail server IP. In these kind of situations if you have dedicated IP free on the server we can redirect the mails though that IP. Or you will need to set a different MX for all domains that will point to a different server.
Changing the interface IP is a good shot. The other option to point your account's MX to a different server will be subjected to a propagation delay (change in MX) and is a tedious process.
After changing the interface IP check if the below criteria is met:
1) telnet your_server's_IP 25
Check if the FQDN which responds with 220 response code, has proper DNS and rDNS records.
But I will strongly recommend you to contact the email providers (hotmail,gmail) to get more info on the mail block. If the root cause of the issue is not dealt, then your new interface IP will get blacklisted in any of the spam DBs and eventually large email providers like hotmail will block your IP.