invalid e-mail address

[atomms]

hello,
i'm getting the message above "invalid e-mail address" when trying to send to any other system user

(roundcube+postfix are working ok when sending e-mail to other domains different to localhost or myhostname)

any ideas?

[JohnDoh]

when trying to send to any other system user

are you entering their address as just `username` or `[email protected]`? the first will not work since its not a valid email address.

[atomms]

i still have no FQDN so i've tried writing:

user
user@localhost
user@ubuntu

and finally got it done writing to:
[email protected]omain

is there a way of configuring roundcube to allow a simple domain without "." in between?