Up.

Tested several topics I subscribed to since. None of them sent me an email. I will try with a personal email but seeing I'm not the only one with the problem, I'm pretty sure it comes from the Bitcointalk server, IP, or I don't know what...

@Jack
Yeah, I checked the spam folder as well.

If Theymos could check about https://wiki.simplemachines.org/smf/E-Mails_-_Why_are_members_not_getting_emails_sent_from_the_forum

edit 1: changed my email to see what it will do

edit 2: Alright, it works with another email (topic notification as well PM notification)
So some email providers don't receive emails coming from Bitcointalk.org and for some, it works only for a few weeks (as mentioned in the quote above). I still believe it comes from Bitcointalk, otherwise, the system (to send emails) wouldn't stop working after a few days. Email providers don't blacklist domain names depending of the weather forecast

edit 3: it doesn't work for some topics, or I shall say it already stopped to work