I have had a very bad experience with Mailfence where emails from well-known domains do not arrive (no, not even in spam) and I never got any response from their support when I asked for their assistance to receive 2FA codes that I needed. Also, Indeed emails consistently show up in the spam folder, no matter how many times I mark them “not a spam”. Sure, I may not be a paying customer but why offer a free tier if you cannot provide a reliable service? This has caused problems for me and if I had known beforehand I would have went somewhere else.