The service doesn't place ads in separate letters added to POP3 account. The service doesn't place ads in beginning of letters. Web-site in English language. The service is more or less reliable, rarely down. Both use same software, both don't place ads in letters at all.
Registration consists of filling of two forms.
OperaMail placed an introductory letter to the POP3 account after registration, so I had to repeat invoking of the script once.