Feature request: exclude IP/network in allow_nets extra field

[@lbutlr]

On 29 Apr 2019, at 19:56, Zhang Huangbin via dovecot <dovecot at dovecot.org> wrote:
> Recently we need to allow some users to login from everywhere except some IP/networks,

Can you use firewall rules for this?

> how can we accomplish this with "allow_nets"?

Allow_nets specifies allowed networks. Doesn't say anything else about any other use.

"The allow_nets field is a comma separated list of IP addresses and/or networks where the user is allowed to log in from."