- Require TLS and authenticated submission.
- Make sure the server is not an open relay.
- Publish SPF, DKIM and DMARC for the domain.
Port 1396: DVL Active Mail
Port 1396 is assigned by IANA to dvl-activemail (DVL Active Mail).
1396
How dvl-activemail works
EmailMail servers hand messages to each other over port 1396, 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 1396 dangerous?
We have no specific security note for port 1396. Its risk depends on the program actually listening on it. General advice for email services:
IANA registry entries for port 1396
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| dvl-activemail | 1396 | TCP, UDP | DVL Active Mail | - | - |
// source: IANA service name and port number registry
Which program uses port 1396, and is it reachable?
Linux
sudo ss -ltnup 'sport = :1396' # process listening on 1396
sudo lsof -nP -i :1396macOS
sudo lsof -nP -i :1396
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1396 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 1396 netstat -ano | findstr :1396
From another machine
nmap -p 1396 -sV <host> sudo nmap -sU -p 1396 <host> nc -zv <host> 1396
Block it in the firewall
sudo ufw deny 1396/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 1396" -Direction Inbound -LocalPort 1396 -Protocol TCP -Action Block # Windows
What is port 1396 used for?
Port 1396 is assigned by IANA to dvl-activemail (DVL Active Mail).
Is port 1396 TCP or UDP?
Port 1396 is registered for TCP and UDP.
Is it safe to open port 1396?
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 1396 is open?
On Linux run "ss -ltnup 'sport = :1396'", on macOS "lsof -nP -i :1396", and on Windows "netstat -ano | findstr :1396" to see the local process. From another machine, "nmap -p 1396 <host>" shows whether it is reachable.