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Dovecot claims ports are in use, netstat disagrees

dovecot would appear to not be aware of (compatible with) portreserve. Check /etc/portreserve for configuration files that are reserving ports you need and remove them from scope (e.g. rename them ...
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How can a server accept incoming traffic to port 443 if it isn't listed in netstat?

check if you have anything in the nat table: sudo iptables -t nat -L
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