Cannot Send Email to Exchange Online - Remote Certificate is Invalid
We have recently migrated from Exchange on premise to Exchange online with Microsoft 365. When updating the SMTP information for Deploy, I am getting the following error:
"The remote certificate is invalid according to the validation procedure."
SMTP Server: smtp.office365.com:587
SSL/TLS: enabled (need only TLS)
Using account email address & password, tried multiple accounts
Anyone successfully got this setup, any suggestions would be greatly appreciated. I have a ticket open with PDQ and Microsoft but have not found a solution yet.