emails undeliverable

Question

Remote server returned '554 5.7.0 < #5.7.520 smtp;550 5.7.520 Message blocked because it contains content identified as spam. AS(4810)>'

Answer 1

Hi,

Are you sending these emails with attachments or links in the message?

This error means your message is flagged as spam by the mail filter. Sign in to Outlook on the web, open the message, and remove anything that looks risky such as large attachments, shortened links, or repeated text. Send a simple test email with plain text only to confirm it works. If it sends, add content back step by step to find what triggers the block. Also check your account at https://account.microsoft.com and verify your identity, then go to Settings, Mail, Junk email, and review blocked senders and rules to ensure nothing unusual is set.