Email marked as spam folder

Emails are classified as spam or not spam by receiving mail server. Usually this analysis is based on SPF, DKIM, DMARC policies, content and links included in the message, attachments, sending IP reputation and other factors.

If you open the message header on the receiving side, you should be able to determine whether the email has passed authentication (look for spf=pass, dkim=pass and dmarc=pass) correctly.

Then, if emails are marked as spam by Google, take a look at their guidelines. If it’s Microsoft, then check this section of their documentation.

It always helps to ask recipients to mark your messages as not spam to help improving your reputation.

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