Here are some things you can do to increase your email campaign's deliverability:
Remove unnecessary caps, asterisks, and punctuation from the subject line and email copy
Limit the number of links in the email body (3 - 5 max)
Segment your list before sending
Only send your email to Active subscribers
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P.S. If you think something is happening on our end that's causing you to see higher than average spam rates, please let us know - firstname.lastname@example.org.