I've contacted an admin for you.

Hi, it's Isaac from the forum. Are you able to check your spam folder? I find sometimes the emails go to spam. If it's not in your spam folder, please send an email to isaac at simutrans dot com and let me know what your username is along with the email address you're using, along with the password you'd like me to set for you (so please don't use a password you use anywhere else, I don't want to know any of your passwords!) and I'll activate your account with the password you send.

Hi, I checked my spam folders on both of the mails I tried, but it's not there.
I'll send an email to you with my informations .

Thank you to both of you !

Thank you for your patience — I've processed your email and you *should* be able to log in now. Please let me know if there are additional problems. My apologies for the inconvenience.

Yes it is working, I have acces to my account right now ! Than you very much, but does that mean I will not be able to change the reset the password in the future ?

Oh, and by the way, I was trying to host a server with the provided server OVH, but I didn't get any mail from there too when creating an account, and the provided mail to contact was not working (I kept having the error message "not delivered")

Nevermind, it's working too ! Thank you, and have a good day