Email issue - webmail accounts

[rad]

OH works for a small company who have an outsourced ICT guy who does their email setup etc.

 

they are having issues with emails bouncing back from webmail accounts, getting the following reply:

The original message was received at Fri, 4 Mar 2011 07:56:05 GMT from [192.168.7.34]

 

----- The following addresses had permanent fatal errors ----- <@hotmail.co.uk>

(reason: 550 SC-001 Unfortunately, messages from [ip address removed] weren't sent. Please contact your Internet serv...ock list. You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors.)

 

----- Transcript of session follows ----- ... while talking to

mx4.hotmail.com.:

>>> MAIL From:<> SIZE=443159

<<< 550 SC-001 Unfortunately, messages from [ip address removed] 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.

554 5.0.0 Service unavailable

 

Their IT guy recommends people change their email accounts....

[theriver]

Suddently not being able to send to a domain that's always worked before is often related to spam blacklists.

 

Have a look at the page referenced in the email:

Troubleshooting and scroll to the entry for 550 SC001, which says:

 

Mail rejected by Windows Live Hotmail for policy reasons. Reasons for rejection may be related to content with spam-like characteristics

 

To check this out, get the public IP address of the mail server and head on over to Email Blacklist Check - See if your server is blacklisted and look it up.