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                noon
            
        The only thing that runs every 5 minutes is mailman gatenews. The issue may be with that. You could try running it manually via _MAILMAN_GATENEWS_NNTP=yes;sudo -u list mailman gatenews
Yes it's mailman gatenews that triggers mariadbd "[Warning] Aborted connection" log entries. I don't use this feature so as a workaround I set a large gatenews_every interval in mailman.cfg.
[nntp] gatenews_every: 1000000m
Thanks for your support.
Andrea