Verify the emails first - to get rid of bounces and fake ones.
Dot use spam words in email message and subject.
preferably dont use URL shorteners in message body.
dont send images in email.
Stay within hourly or daily allowed sending limits!
If they want to opt-in then it is no problem since they want to receive email from you. If it's an email list that don't opt-in in your niche don't bother and be aware of CAN-SPAM
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