Real emails constantly going to SPAM
Too many legitimate emails are going to SPAM, including contacts, long conversation threads, and replies to emails that have been sent.
I'm unsure how someone I put in my contacts, or have been sending emails back and forth with, or have just sent an email to which they have replied are going to SPAM regularly each day
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Joe Manlio
shared this idea
This issue might happen due to the senders' IP reputation or email content such as pictures/links. The more often you mark these emails as Not Spam, the more you train your personal mail filter to recognize them as legit.