I'm going to try answering everyone's questions about the mail spam here:
@darekpawlo @AgentKuga @ZdrytchX @no168_92 @ajddavid452 Blocked users can't send you mail, but the person doing this creates new accounts every single day to send more, usually multiple accounts. So blocking doesn't help much.
@Tetragramat Reporting is useless for multiple reasons. 1. As noted above they keep making new accounts every day, so it doesn't even slow them down. But there's also 2. The mods don't seem to care very much. The last time I reported the spam was when I spotted some just minutes after they were sent, so it was a fresh account. They could have banned it and stopped more messages being sent, but it still wasn't banned the next day. I also private-messaged a mod on Discord to tell them about a possible alternate method the person could use to harass once the long-promised-but-not-delivered ability to limit messages to friends was implemented and their reply was: "Dunno" I can provide a screenshot to prove this. I'm not reporting more, because it's clear the mods don't care, probably because
they aren't getting spammed.
Also, yes, they do know they're making new accounts, but they don't seem to be doing anything to stop it happening.
@Serenata We've been told that's coming in the next version of Mangadex for at least four months now. Still not here.
@Nick86 No, they haven't limited it. When you get fewer messages it's because the spammer decided to send you fewer messages that day. Sometimes I get one message a day, sometimes four from the same account. The mods appear to be doing nothing at this point, including being very slow to ban reported accounts (see my reply to Tetragramat above).