One of my domain is using https://www.cloudns.net/ as DNS server, they also offer email forward, so I need to setup my MX to
5 mailforward1.cloudns.net 10 mailforward2.cloudns.net
to use the email forwarding.
Everything is perfect except the
mailforward1.cloudns.net and 2 as well, are heavily listed in many popular blacklist. I can understand that since they just forward email and not care about who sent it or what content it is, so it will have bad reputation. And amazingly, the blacklist of the mentioned domain/IP does not effect I receive the forward emails.
What I wanna ask here, is not I will use these smtp server to send email (I cannot anyway, since they are not for public to send email).
My question is: for the emails I sent, which contains the domain that has above smtp server as MX, will the blacklist of the MX servers cause my email has higher spam score or cause no-delivery.
If answer is yes, the domain in the email will effect the delivery, then what kind of remedy do you suggest except not use the email forwarding service.