Using Postie v1.5.0
On install, I get this error message:
"Warning: the Admin username is not a valid WordPress login. Postie may reject emails if this is not corrected."
Since WordPress accepts my WordPress login and it works OK, I was confused as to why Postie throws this error. I see on looking at the settings that it is a Postie setting that needs to be changed on setup.
I think a better error message would be:
"Warning: change the Postie admin username in Postie settings to be a valid WordPress login. Postie may reject emails if this is not corrected."