Forum Discussion
Office365 support incompetant - All emails marked as spam due to hyperlinks in email siganture
Hello all,
This thread has come to my attention. Let me fix some misconceptions:
Office 365 absolutely does scan messages "on the way out". This is done to protect our IP reputation. If a message is deemed spammy, then it will be marked as spam and sent out via a special pool of IPs. This pool of IPs has questionable reputation and we do not attempt to maintain their reputation. We do absolutely monitor the reputation of our good IP addresses - so much so that I'm fairly certain that is not an issue here.
Most often, I do see false positives happening when someone creates an automated email signature with links in them. A false positive requires a spam rule to be adjusted on our side. This is simple -
1) First report the problem in Submissions Explorer
2) If not getting headway, open a ticket - we just need the samples with the full headers showing what happened so that our engineering team can correct the rule. It is an easy fix - if you're not getting the help you need from the support, point them to this post as guidance.
I apologize for any inconvenience.
Regards,
Scott
Loryan
The Outbound spam option is enabled on all our emails in office 365 and the header details captured states that the message was flagged as SPAM SCL5 by the Forefront server.
We have everything in place, SPF, DKIM etc etc.
Moreover this problem all of sudden started 2 weeks ago and got resolved by itself yesterday.
Even the support team has no clue as to what triggered this issue.
Regards,
Terence
The problem you had with your mails being rejected as spam, might be due to the fact that multiple Office365 outbound SMTP servers are listed in email blacklists;
eg:
https://mxtoolbox.com/SuperTool.aspx?action=blacklist%3a104.47.5.207&run=toolpage
https://mxtoolbox.com/SuperTool.aspx?action=blacklist%3a104.47.116.242&run=toolpage
They have started changing the IPs that they send emails from, however large volumes of spam are still being relayed so its only a matter of time the new IPs get blacklisted again.
I believe the IP must have got blacklisted as you mentioned, anyways its all good for now...Than for your help...
I am having the exact same issue with our emails. All are leaving marked as SCL=5. We have our social media links in our signatures and those are the ones being marked as spam. We have had those signatures for years. Everyday we get users blocked because of sending spam. I've tried using outbound transport rules etc. I have opened a ticket and it gets closed just like yours. No solution so far. Just started a couple of months ago.
- Pretty sure your Office365 outbound SMTP servers have been blacklisted. Try to look for Servers that are taking care of your email delivery and check if the IP addresses have been blacklisted by spamhaus etc etc...
