[Users] Disable IPv6

[Edward]

Would it be appropriate to submit an enhancement bug report for an
option in Claws to disable IPv6?

I am testing out other Linux OS' in virtual machines, which only
provides IPv4. One of the IMAP servers accessed, pretty much forces an
IPv6 connection and with Claws, it's been hit-or-miss. 99% of the time,
it's a miss and the Network Log always shows 'connection refused'.

In order to access the same IMAP server using Thunderbird, this required
going into its Preferences Editor and disabling IPv6.

I installed Clawsker to see if such an option to disable it were
available, but there wasn't.

Thank you.