The submitted title was "Domain registrar Gandi gets bought out, screws existing customers". The latter bit is linkbait so I've edited it (as the site guidelines request - https://news.ycombinator.com/newsguidelines.html ). But I realize the OP isn't just complaining about price increases, so if someone can suggest a more accurate and neutral title, we can change it again.
Perhaps the title should indicate that Gandi is rugpulling email accounts from people who have prepaid for domain registrations.
They haven't told me I'm losing my mailbox yet but I'm on the lookout.
The free mailbox was honestly one of the biggest reasons I chose Gandi, and I would not mind paying for it at all - preferably not under duress though!