error: Incomplete maildomain
application: pine, alpine
resolution: You need to put an fqdn to your hostname in /etc/hosts file.
example, if your hostname is foo and you got this error:
[Incomplete maildomain "foo".]
you need to put an fqdn (foo.com in this example) to your hostname (foo) in your /etc/hosts file.
127.0.0.1 foo foo.com