E-Mail tool cannot sign onto M365 over SMTP
We are currently having an issue when one of our partners is trying to Send E-Mail over SMTP. He receives the following error:
He is able to connect to M365 over Telnet TCP 587 on the Server he is trying to sign into M365 with the tool they are using. Do you may know what the issue could be?
Thank you for your help.
Does your partner is trying to connect behind a Firewall??
Bühler Gabriel, I wanted to follow up and know if the below responses helped in answering your query. If it did, please do not forget to accept the appropriate response as Answer so that others in the community facing similar issues can easily find the solution.
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