550 SC-001 Error


New Email
I am back again with problem, which i didn't have for a long time.

We are running email marketing campaigns locally for our clients and we do send a lot of emails, but in a few years time we didn't have this like bounce from Microsoft:

SMTP error from remote mail server after MAIL FROM:<bouncestracker@****.rs> SIZE=7200:
host mx1.hotmail.com []: 550 SC-001 (COL0-MC4-F47) Unfortunately, messages from **** 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 Troubleshooting.

I've tried to find solution but still no luck. Any advice?


EQ Forum Admin
Staff member
Hi stefan,

First please verify you are not spamming etc. Even if your campaigns are not spamming there could be a problem with a web form that being used to spam etc. You can check this easy enough by skimming your outgoing mail logs for problems. Also, here are our Top 10 Email Marketing Tips

Once that is done see this link - Hotmail Blacklist
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