Forum Discussion
Recipient suspects your message is spam and rejected it.
When Office 365 tried to send the message to the recipient (outside Office 365), the recipient's email server (or email filtering service) suspected the sender's message is spam
2 Replies
Yeah, that usually means the receiving server flagged your message as spam. Could be due to your email content, domain reputation, or missing SPF/DKIM records. I'd check those first.
Avoid rejection by having recipients whitelist your mailbox and then check SPF/DKIM records.
