Most of those rules you will find ridiculously logical, though, most of the time some are being ignored. We can't guarantee, but if you follow most of them, your email deliverability will sky-rock:
21 email marketing rules
Don't buy email databases
Don't collect open email addresses from websites
Remove email addresses that regularly receive delivery error messages
Don't write in capital letters
Do not include videos, flash videos, or JavaScript in your email
Do not embed a form in the email
Do not include attachments
Don't use words that spam filters respond to (for ex. "Cash bonus", "Free membership", "Save up to")
Don't use red font
Don't make spelling mistakes
Don't overuse keywords
Images should not be too large or too small l to bypass spam filters
Update and clean up your mailing list
Try to re-engage subscribers who are inactive or occasionally active
Use double opt-in subscriptions to bypass spam filters
Ask subscribers to add your "from email" to the address book
Add an unsubscribe link to your email (gets added automatically at NetHunt)
Don't ignore newsletter unsubscription
Enter a familiar name in the "Sender" field - hopefully, that will be you and your subscribers know you
Keep your emails short
Test emails before sending, including your mobile device
Testing your campaign
There is one service we really want to share with you to ensure your e-blasts have a high chance to reach the recipient's inbox. Feel free to test your campaign with Mail Tester. You simply need to campaign to the email (just follow the link).
Once sent, you'll receive an email score as per screenshot:
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