I have seen many spam messages using free services.
As they detect smtp validation as valid, how to deal with this as score is also very high due to premium domains.
Could you elaborate a bit - are you referring to ensuring outgoing emails sent using PHP are being marked as valid? Or outgoing mail at the server level, etc?
When we receive an email per contact form it is very easily marked as valid email address due to premium domains which are free and filter will not work in this case. It means an email is received per contact form. Message are sent using PHP from contact forms which are placed on website.
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