imapc_port not working

[David Tildesley]

Hi,
Dovecot v2.3.7.2 on Ubuntu 18.04LTS

I have configured for imap proxy to imap.gmail.com
However whilst the imapc_host setting is working, imapc_port is not - it ignores the value I set and dovecot always tries to connect to gmail on port 143 (as per error log output).
I have the imapc settings in the 10-mail.conf which gets loaded by dovecoat.conf
Looks like a bug.
Any assistance would appreciated.
Regards,David.
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