I can understand the frustration but let's face it: you cannot fool huge email providers such as Gmail. They have huge userbases and if their users mark some of your messages as spam then you're screwed.
I am email admin since 2003 and I have real email users, i don't take customers who send any sort of automated messages, and I never had any issues besides the occasional compromised mailbox once in a while, and that was way back in the day...
I am email admin since 2003 and I have real email users, i don't take customers who send any sort of automated messages, and I never had any issues besides the occasional compromised mailbox once in a while, and that was way back in the day...