Have just installed K9 Mail on a Galaxy S5, Android version 6.0.1
To hide the name of an email account/box on a server, I use different names. So I can’t see how to set this up in K9 Mail.
For example, server username is fredbloggs-mailbox@example.com
K9 Mail username is obviously the same for POP3 and SMTP, and it works.
But where do I setup a default email address of the format fredbloggs@example.com
(I have email forwarders setup on the server of course)