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Free Custom Domain Email
Inleed is a decent Swedish hosting company, it's just the perfect size. Not big enough to be douchy, yet big enough to be stable:
https://inleed.se/inleed/ (not a one-man show, but a 8-person show)
They recently, quite possibly something they'll regret, opened a free custom domain emailing service.
Their support is the best I've seen honestly, but is NOT INCLUDED is this package. This is free custom domain emailing for people that never need a thing.
I don't see any information about it really, so account for no backups, shit deliverability and a lot of downtime.
However, that's not my experience as a paying client. They've been near perfect (their web hosting is extremely cheap in Swedish standards though, so they really crowd those servers, I've seen like 7 second load-times on vanilla WP sites, going to like 5 seconds with caching, really not that great).
However, for those of you that would like to try, maybe hosting email for custom domains that's not really that important (maybe it's great, but only time can tell), I'd give them a try.
They even seem to have translated the process as well.
Signup: https://inleed.xyz/register
Login: https://inleed.xyz/login
Information (only in Swedish): https://inleed.com/inleed/news/gratis-e-post-for-egen-doman
Translated information (roughly):
For our free e-mailing service (https://inleed.xyz) there's now support to add domains that you yourself own, for which you can create e-mail accounts. Remember that our free e-mail service comes without support.
I chatted with them regarding this, the conversation:
Me: Tja! Vilka begränsningar gäller i gratis e-post? (Yo! What are the limits in the free e-mailing service?)
Me (after 10 minutes): Tja? (Yo?)
Them (after 20 minutes): nothing
So that's that.
I don't (and never have) use/used it, I have a paid Migadu account that I've crowded with me, my mom and my client, and losing a client due to e-mailing issues just isn't worth it, but I know some of you would like this very much.
Please don't abuse this, I'd guess they have strict outgoing filters since it's a free service, but don't make them kill the project 
Peace! 
Comments
nothing is free until you start paying me.
nice offer! but then.. they might go the google way! ask for payments someday.
but until that why not give it a try!
Your cheque is in the mail