can't send emails via imap or php

[cancian]

Hi, my username is cancian, and I can't send emails using my IMAP account or via PHP on my websites.

I've tried using tommy.heliohost.org as the IMAP server, but it still just receives emails, it doesn't send any. The "forgot my password" also doesn't work on my websites,  no mail is sent.

The affected domains are "Ateus.net" and "Dietclock.app".

Any help is appreciated.