Exactly one month ago I sent them an email with the signed message. They asked me to email from the email I used to lock the account. I explained them the situation -

1. Yop mail is open access email. That's why I changed the email but random person clicked the link & my account got locked.

2. I signed a message from an unedited address from over 2 years ago. I didn't change the password as well. so it's clear account is not hacked.

3. I am surprised that people who are in charge don't even know how yopmail works.

they replied to me twice but after I explained the situation they are not replying again. I just feel bad that they don't care about their users.