Earlier quoted context omitted.
I’ve also been getting subtle professional spam consisting of very short emails, something like: from: kate.random.but.reasonable.name38 @ gmail . com Sorry for the delay, here is my email. Best, Kate Sometimes they are more obviously spam, but other times it seems nearly impossible for a spam filter to stop, like the example I provided.
I've gotten those, assume they are to try and train gmail to think they aren't spammers for future spam messages.
I was always assuming that if I reply, then they would send the spam links, but your theory is better.