Keep in mind that emails have a scoring system and each provider manages a SPAM filter according to that score, when writing an email note the following points by which an email can be detected as SPAM : p>
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Do not write the whole subject in capital letters p>
Do not use many exclamation or question marks in the subject p>
Do not use the "$" sign at the beginning of the subject p>
Do not use e-mail addresses in the subject p>
Do not include the words "free" or "viagra" in the body or subject of the message p>
Do not include more images than text in the body of the mail p>
Do not write the body of the message in HTML using very large fonts p>
Do not write the body of the message in HTML using a font color similar to the background color p>
Do not send mail from an email address that starts with many numbers p>
Do not send a subscription link or unsubscribe p>
Not having a signature full of images separately p>
Send the email both in text format and in html p>
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Also, keep in mind that the recipient emails work under their own anti-spam policy, so there will be entities that take the emails as such, the user must include the recipient's email on their desired white list of emails. < / p>
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Finally, keep in mind that from your cPanel you can manage whitelists, blacklists and activate or deactivate the anti spam filter. p>