It happened that one of the times they put an unsubscribe link at the bottom, but if they didn't I just sent them to junk. (The way to market new infrastructure tooling is not to cold-email people that've worked here for a month.)
I usually send a precanned speel if they keep following up - "If it would be rude on a dating app, it's rude in professional email. Take the no and stop contacting me."
This should be day 1 in outbound sales training. I don't understand how folks can think this is the right time to try to sell. A couple weeks into a job at a new company, I doubt I even know what we use now that you're trying to sell me a replacement for.
One concise cold email introducing yourself, I'll probably save it for later if it looks compelling. But multiple "needy" follow-up replies can leave a really poor first impression.
really underestimating the amount of data they have to correlate. Ip, geo, etc.
When a new employee joins the company, they will start getting texts to their personal phone number "from the CEO" asking them to handle an emergency by accessing a link or sending a file or whatever. It seems to happen right after they update LinkedIn with their new job. We also get email-based versions, but those are usually easy to block.
It's frequent enough now that we warm each person about it specifically as part of our initial welcome email and tell them to expect it.