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> Never noticed someone trying to send a email to any addresses I haven't previously used.

At least a few years ago, I noticed a lot of spam to <random first name>@<my domain> -- i.e., completely made-up addresses that I had never used. Since messages sent to those addresses were guaranteed to be spam, I started treating them as free training data for the spam filter.

I don't know if this still happens, though, because I haven't looked.

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This is currently happening to my email domain. Gets rejected as it doesn't have a valid hash (recipient name), but the logfiles are full of <3 letters>@mydomain.com and <english_word>@mydomain.com rejections.

Yeah, this is an age-old issue -- in the early 00s, my mom got a domain and used the email <first_initial>@<domain>.com. She gave up battling the deluge of spam after about a year. We looked through the logs, and saw that her next choice of handle was also getting tons of spam, too, because it was also short.

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