- Require TLS and authenticated submission.
- Make sure the server is not an open relay.
- Publish SPF, DKIM and DMARC for the domain.
Port 2593: MNS Mail Notice Service
Port 2593 is assigned by IANA to mns-mail (MNS Mail Notice Service).
2593
How mns-mail works
EmailMail servers hand messages to each other over port 2593, one hop at a time, until the recipient's server.
- Transport
- TCP · UDP
- Exposure risk
- not rated depends on the program listening
- Encryption
- Unknownnot stated by the registry
- IANA status
- Assigned1 registered service
- Range
- Registered (1024-49151)
- Category
Is port 2593 dangerous?
We have no specific security note for port 2593. Its risk depends on the program actually listening on it. General advice for email services:
IANA registry entries for port 2593
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| mns-mail | 2593 | TCP, UDP | MNS Mail Notice Service | - | - |
// source: IANA service name and port number registry
Which program uses port 2593, and is it reachable?
Linux
sudo ss -ltnup 'sport = :2593' # process listening on 2593
sudo lsof -nP -i :2593macOS
sudo lsof -nP -i :2593
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2593 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 2593 netstat -ano | findstr :2593
From another machine
nmap -p 2593 -sV <host> sudo nmap -sU -p 2593 <host> nc -zv <host> 2593
Block it in the firewall
sudo ufw deny 2593/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 2593" -Direction Inbound -LocalPort 2593 -Protocol TCP -Action Block # Windows
What is port 2593 used for?
Port 2593 is assigned by IANA to mns-mail (MNS Mail Notice Service).
Is port 2593 TCP or UDP?
Port 2593 is registered for TCP and UDP.
Is it safe to open port 2593?
It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Require TLS and authenticated submission.
How do I check if port 2593 is open?
On Linux run "ss -ltnup 'sport = :2593'", on macOS "lsof -nP -i :2593", and on Windows "netstat -ano | findstr :2593" to see the local process. From another machine, "nmap -p 2593 <host>" shows whether it is reachable.