How to configure dovecot imap to listen on multiple ports?

[Gedalya]

On 08/25/2014 08:26 AM, Jochen Bern wrote:
> Well, if offering the*exact same*  functionality on a second port is all
> that needs to be done, having the server's host firewall (iptables?)
> duplicate the NAT on your border firewall for internal accesses should
> do just fine; no need to majick it into the dovecot config (which opens
> the possibility of functional differences being introduced unintentionally).
>
> Assuming Red Hat or similar with no conflicting iptables rules (yet),
>
> # iptables -t nat -A PREROUTING -p tcp --dport 30xxx -j DNAT --to :143
> # iptables -t nat -A PREROUTING -p tcp --dport 30yyy -j DNAT --to :993
> # service iptables save
>
> Regards,
Since you're redirecting to a port on the same host, the following is 
perhaps more correct:

iptables -t nat -A PREROUTING -p tcp --dport 30143 -j REDIRECT --to-port 143