Check if port 993 is open
On the server, see what is listening:
sudo ss -tulpn | grep ':993 'From another machine, test reachability:
nc -zv your-server.example.com 993Port 993 (TCP) — IMAPS
IMAP over TLS.
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- Port
993- Protocol
- TCP
- Service
- IMAPS
- Internet exposure risk
- Low
Standard secure mail retrieval.