The edit summary (shown in the review page as a 'Comment:' above the title) contains an e-mail address - that's what's being spammed. The edit itself is irrelevant; apparently removing a tag is deemed easier / less suspicious by the spammer than editing the body of the post.
Also, the second part of the rejection reason might apply to cases like this:
If it happens again:
Go to one of these users profile, then to one of their posts.
Flag the post, use it needs ♦ moderator attention/other, and explain what you think is going on.
This is better than public shaming. You might be wrong, and this case it would be very unfair to expose the user in a public post.
Blacklisting wouldn't really help as the spammers tend to go through many other sites as well. A couple of solutions were presented here, Recent Mass Football Spam. Most active mods on SE and the staff are aware of the problem as it's SE wide and it has happened in the past.
Previously, I used to drop all spam accounts into one master account and then ban ...
We get these from time to time, and sometimes I wonder if it's just a matter of people not wanting to ask a new question about password recovery (by slapping their email address in there, they perhaps think it will become part of the post).
Glorfindel gave a good explanation as to how spammers not familiar with how the sites work tend to use this method as ...
It qualifies as self-promotion as the link is also in their profile section. Comment, asking for affiliation. If they don't take the time to respond then they are indeed just dropping their business card and leaving, so delete sounds reasonable.
See: What is the official policy on identifying yourself as a team member for a product?
I know that since I have joined Web Applications and gained the respective rep points I have tried my best to regularly clear the review queue for First Posts and Late Posts. I try to flag these types of posts as spam when I encounter them.
I have noticed that when I check these users profile they usually have only been members for a few hours and they ...