Within the control panel of the host provider of my domain 'mydomain.com', I've configured a recipient address that forwards all the emails to 'hello@mydomain.com' to 'myprivatemail@gmail.com'. It worked ok, but some days ago, it stopped working.
If I send any email to 'hello@mydomain.com', I get the following message:
550-5.7.1 Our system has detected that this message is likely unsolicited mail. To reduce the amount of spam sent to Gmail, this message has been blocked. Please visit https://support.google.com/mail/?p=UnsolicitedMessageError for more information.
In the mentioned URL, I think that the following page may show the most useful advices: https://support.google.com/mail/answer/175365?hl=en
So I decided to contact my host provider to ask about such advices (Ownership and Filtering, Authentication, modification of the forwarding settings, forwarding as 'Send mail as'). However, my host provider just told me to "use the Gmail POP client". In my opinion, it makes no sense.
Any tip is welcome. Thank you very much.