Dovecot (director, lmtp) IPv4/IPv6?

[Andrey Fesenko]

On Fri, Jan 29, 2016 at 5:38 PM, Timo Sirainen <tss at iki.fi> wrote:
> On 28 Jan 2016, at 12:35, Andrey Fesenko <f0andrey at gmail.com> wrote:
>>
>> Jan 28 13:12:49 mail dovecot[11118]: director: Fatal: Invalid director
>> port in IPv6-local1
>
> b) Append :port after the address (it'll look ugly/confusing, but should work for now - maybe in future it gets changed though)
>

What format dovecot expects to receive port? Colon is used to separate
parts of the address, dovecot accept any format [IPv6-local1]:port ?