Well getting in to the /e/ OS Eco-system I had a little trouble with getting K9 set up. Here are the setting used and the issues I found along the way.
For manual configuration, please use the following settings:
Incoming setting(Fetching mail):
IMAP server: mail.ecloud.global
username: your Murena address in full (example: john.doe@e.email or *john.doe@murena.io)
password: your Murena password
port: 993, SSL/TLS, requires authentication
Outgoing Setting(sending mail):
SMTP server: mail.ecloud.global
username: your Murena address in full (example: john.doe@e.email or *john.doe@murena.io)
password: your Murena password
port: 587, plain password, STARTTLS, requires authenticationn
This info can be found here
https://doc.e.foundation/support-topics/configure-email
The two issues I had were “Sender adress rejected: Not owned by user” and “Email is not valid” The email not being valid was due to me forgetting the .io at the end of my adress (Example@murena not *Example@murena.io). The other was due to when setting up my account the first letter was not the same case as the username.(*Example@murena.io =/= *example@murena.io)
This page is what lead me to that:
https://support.mozilla.org/en-US/questions/1183579
I hope this helps!
P.S. the stars in front of Emails is due to the limit of two links per post for new users.