Very low priority, this one. I have an email address for my website on MDDhosting. (Let's say, email@example.com). I also have a Gmail account. (Let's say, firstname.lastname@example.org.)
The Gmail account can "send as" email@example.com (meaning, I believe, it uses my MDDhosting SMTP server). Aside from that, there is no forwarding between the two. Each has its own incoming address. No interference there.
When I attempt to send from the Gmail account to the MDDhosting address, the email gets bounced. (All other mail from everywhere else in the www gets delivered correctly, AFAIK.)
I think this bounce occurs before any user- or account-level filtering. Is there any other manner in which I might "whitelist" (so to speak) email from my own Gmail account?
As I say, very low priority. A matter of cosmetics, only, for a perhaps over-eager email junkie.