Apr 01 2020 06:34 AM
For the past 2 days I have been unable to send any emails, receiving them is fine. Error reads "Your message couldn't be delivered because you weren't recognized as a valid sender. The most common reason for this is that your email address is suspected of sending spam and it's no longer allowed to send email. Contact your email admin for assistance." Any ideas?
Apr 01 2020 10:02 AM
Did you contact your IT folks? They have a way for checking and unlisting the account, depending on the situation: https://docs.microsoft.com/en-us/microsoft-365/security/office-365-security/removing-user-from-restr...
In case the IP itself is blocked: https://docs.microsoft.com/en-us/microsoft-365/security/office-365-security/use-the-delist-portal-to...
Apr 06 2020 12:59 AM