Noop, make sure
Your mail server is not open mail relay
Your mail server has reverse IP address
Your mail server has SPF dns recored
There are online tools that you can use to help analyze your emails for trigger phrases. I think they just use SA on the backend to generate a ranking.
ActiveCampaign, Inc. - Email Check - Analyze your email through a spam filter
Email & Spam Statistical Analysis Online
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Rocky Jr.
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