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When used SMTP settings mail received in SPAM Folder

When I used SMTP authentication for sending mail from Mautic, it end up into SPAM folder. While investigated mails received are not having Message Headers. Can anybody help how I can solve this issue.

When I used SMTP authentication for sending mail from Mautic, it end up into SPAM folder. While investigated mails received are not having Message Headers. Can anybody help how I can solve this issue.

There are a few factors
SMTP server maybe is Blacklisted
DKIM Configuration
Bat use of words that trigger spam filters.