I have a strange issue. After configuring Rainloop I am able to send mails, for example to gmail.
Also when I send from the contact form on my website, which is the same domain I again receive the mails.
However, once I try to send an e-mail from gmail to my CP mail it is not delivered.
All MX records are fine I’ve even managed to issue SSL for the postfix.
I am using UpCloud machin and CF DNS.
Any help would be appreciated, as it gets very frustrating, dealing with this.
Also when I try to connect the mail to an external client like Gmail, Thunderbird or Native android one, I get that “Could not open connection to server” or “Could not connect to server”.