This freaked me out the first time I used Mail. It rendered a PDF about buying bitcoin on PayPal (I don't have PayPal). Looked at the same email in Gmail and Thunderbird, it's just a PDF attachment, no message, and the sender was different. No wonder people are falling for those scams, Mail makes it easy for them.

Now if only I had a better client on my phone (never buying an iPhone again)

What made you prefer Mail to Gmail, given you don’t seem satisfied with Apple’s Mail app?