Emails being rejected

[mikeingham]

A couple of our student office 365 email accounts have been compromised and sent ou in excess of 10000 emails each before Microsoft blocked the accounts, they then blocked our whole domain from sending emails.

 

I resolved the issues with the rogue accounts and contacted Microsoft. After about an hour they unblocked our tenancy, and everything back to noirmal

 

However we are now unable to send any emails to any gmail accounts, because google our rejecting everything from our domain as spam.

 

Does anyone know how I can get this resolved with google, as their help doesn’t seem to be very helpful, and very much directed at single users.

[TechMonkey]

I don't think you can, it will be the MS server IP that is being rejected. It will pass, but not sure the time frame.

[robintech]

There is a rule for setting groups sending abilities , your woe reminded me to add in new year groups as I was a few years behind

https://security.microsoft.com/antispam

 

https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/outbound-spam-policies-configure?view=o365-worldwide

Edited March 3, 2023 by ittech2342323

[mikes]

I don't think you can, it will be the MS server IP that is being rejected. It will pass, but not sure the time frame.

 

We had this a few years ago, and we had to just wait a month or so before Google, Hotmail etc unblocked us. Check the blacklist on mxtoolbox and it should tell you more information. It caused havoc with staff who needed to send "important" e-mails to gmail accounts etc but there was nothing I could do. Google just sent me to an FAQ page about how to set up mass mailers.

 

On this subject does anyone use SIMS Intouch? We are finding a lot of our e-mails sent via Intouch get rejected as spam from Yahoo and Hotmail accounts