Good afternoon, I am trying to configure Alertmanager to send emails and it is driving me crazy. First, I had a TLS error, which I resolved, but now I am getting the following error:

level=error ts=2024-07-04T14:30:58.691Z caller=api.go:808 component=api version=v1 msg="API error" err="server_error: send MAIL command: 550 Access denied - Invalid HELO name (See RFC2821 4.1.1.1)"

If anyone can help me, I would be eternally grateful. Thank you. P.S. I am using Docker.