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The original was posted on /r/sysadmin by /u/myblusky on 2024-01-23 22:45:15+00:00.
I'm "the IT" guy of the company I work for. It is not my main job here, I just did some IT work in my previous life so I got assigned this stuff. We are a small company of about 20 people. According to the users the past two days, some emails we send to clients are getting bounced back. Of course, they never tell you when it starts happening, only several days later. /s These are people we have sent emails to previously without issue. Sometimes, even though there's a bounce back, the client still receives the email as confirmed by a phone call.
Our email is via Office 365. Was previously with GoDaddy's O365 offering but I migrated us away from that on Dec31/Jan 1 and have been running without issues until two days ago.
Below is the same info I keep seeing on these bounce backs. What's the best route of correction?
Error Details
Error: 550 5.7.350 Remote server returned message detected as spam -> 554 5.7.1 DNS Blacklisted by bl.spamcop.net hostkarma.junkemailfilter.com
Message rejected by: secureyourmail.com
UPDATE: It appears this has been ongoing since Jan 4th.