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Message Rejected Due To Spam Classification

Likely causes


1. sending mail cc/bcc'd to large numbers of recipients
2. Similar mails have been marked as spam by lot of users
3. Using outlook and your IP is blacklisted by lot of Anti SPAM engines.
4. Domain is blacklisted


Resolution


1. Try to send to specific and few people
2. Change the subject and body then try
3. If you are sending the message through App , please add the Public IP in SPF
4. If you are using outlook , use Gmail
5. Try to get the IP and domain whitelisted , if they are blacklisted (check at mxtoolbox.com)
6. Ensure SPF and DKIM for the domain
7. Remove Signature and check

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