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I am trying to send emails from my website. As in: Someone signs up, so they get sent a mail. No plugins to interfere, unless Smush and Hello Dolly are evil! All original script. When I send a test email via the WP Mail SMTP settings any mail address works fine. But when I try and use wp_mail() in a basic test script it suddenly decides that Gmail, Exchange and the biggies are ok, but the lesser-knowns are a no-go. So what is the “TEST EMAIL” function doing that isn’t translating to wp_mail(), making it prefer some addresses over others? Something in the core PHPMailer script maybe? Please help!