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Lemmy is probably hurting email spammers because users and community names look like email addresses.
At my instance I did setup a email wildcard (receive emails from any address on that domain which don't already have a account) and I get a lot of phishing and scam emails, most of them are send "to" /c/[email protected], as link to this community is linked in sidebar, but I also seen emails "send to" random usernames
So yeah, It is happening, i wonder how bad it is on larger instances