postfix won't restart

[email protected] (Steve Blinkhorn)
Newsgroups gmane.os.netbsd.general
Organization Psychometric Research & Development Ltd.
Message-ID <[email protected]> 
This is NetBSD_9.2 amd64 on a server that is only used to send outgoing
automastic emails to clients when they have made use of our services.

Last changes to main/master.cf two years ago, otherwise running since
2016.  I can't tell when it fell over, but 'postfix start' fails with
no diagnostic error message.

Where to start?

-- 
Steve Blinkhorn <[email protected]>
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