Let's assume you are running your own SMTP server and the server received an email with the following headers in it:

Return$-$Path:

Delivered$-$To: aa@cs$.$fiu.edu

Received: from mail.cs$.$fiu.edu $([127\mathrm{.}0\mathrm{.}0\mathrm{.}1])$

by mail.cs$.$fiu.edu with LMTP

id B$0$LwK$3$tP$4$GPacxQAj$2$tSdQ

$($envelope$-$from $)$

for ; Sun, $05$ Feb $202319$:$53$:$15-0500$

$...$

Date: Mon, $06$ Feb $202300$:$53$:$14+0000($UTC$)$

From: TikTok

Message$-$ID:

Subject: Leon The Cat Dad: I think you know my #cat

Reply$-$To: edm.support@tiktok.com

$...$

Can your SMTP server reliably determine that this email is indeed from TikTok and not some kind of spam?