SMTP a security problem?

Hi, I just installed your plugin and everything went perfectly. My website’s outgoing email immediately started landing in people’s inboxes rather than in their spam folders.

But since I’m a novice at these matters and don’t know SMTP from RSVP, I did some reading on SMTP, and on one website I came across made this statement:

“Another strategy that hackers use: If your app sends email using SMTP, the IP address will be recorded in the Received header lines. Either scrub the original Received line [no explanation provided of how that’s done], or don’t use SMTP for email submission.”

Is this something I should be concerned about security-wise? Or does your plugin solve this problem somehow? And if not, how should I fix it?

Thanks!

https://ww.wp.xz.cn/plugins/gmail-smtp/