[Dovecot] ipv6 not working

I added an listner to dovecot bye adding the following lines to config but no result no connectivity with ipv6:

imap_listen = [::]

pop3_listen = [::]

imap_listen = *

pop3_listen = *

Met vriendelijk groet,

Bas van Dikkenberg

GISkit bv

BFVD1-RIPE

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