So, I've been getting a variety of emails attempting to recruit me for years. Some are worth responding to; others are clear misfits, or look like the sender never actually read my LinkedIn profile. This I understand.
But over the past year or so, I've been getting repeated low quality recruitment emails from the same source, with the followups having text like "Just wanted to follow up one last time to see if you would be interested in hearing more about xxxxx! Please let me know and I would be happy to set up a quick chat!" It's not one recruiter or one company, and it's in-house recruiters as well as body shops. The main thing they have in common is that the original email feels generic, or in some cases is peddling obviously unsuitable positions.
What I'm wanting to understand is when and why recruiters send these emails. Does it imply anything about their difficulty in filling the position(s) they are peddling? Does it imply anything about their evaluation of the email recipient (me)? Or is it most likely just that they've adopted a new (and annoying) practice of retries even for generic stable-building, perhaps encouraged by some new recruiting software package?
[Edit: I'm asking about the meta-recruiter spam in particular - spam encouraging me to respond to earlier spam from the same recruiter. Some answers seem to just apply to recruiter spam in general.]