Are you sending from an adult name? My customer support emails are all mainstream sounding names. Listed on billing statements and the contact us. If all settings are correct maybe your email url itself is getting caught by yahoo profanity filter or something.
But most hosts will tell you till the cows come home all email settings are correct, when they actually are not. It's usually the rDNS email setting that is not configured correctly.
But most hosts will tell you till the cows come home all email settings are correct, when they actually are not. It's usually the rDNS email setting that is not configured correctly.

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