Add possibility to overwrite system's gethostname()

[kakaska]

Would it be possible to add an option to overwrite the system hostname?
Sometimes the system hostname is just 1 word without dots however some mail servers require a fully-qualified hostname:

user@myhostname:~$ vrfy -d -h -n example@email.com
...
>>> EHLO myhostname
smtp phase EHLO wait
...
>>> MAIL From:<>
smtp phase MAIL wait
<<< 504 5.5.2 <myhostname>: Helo command rejected: need fully-qualified hostname
>>> RSET
smtp phase RSET wait
<<< 250 2.0.0 Ok
>>> QUIT
smtp phase QUIT wait
<<< 221 2.0.0 Bye
example@email.com ... Remote protocol error

[robohack]

Good idea! Yes it should be possible. I can't promise how quick I can work on this though.