Port 465: SMTPS
Mail submission over implicit TLS, for mail clients sending through their server. Needs authentication. Watch for compromised accounts sending spam through it.
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Port Lookup
Port 465 at a glance
Port465
ProtocolTCP
ServiceSMTPS
Open to the Internet?Yes, if you run this service publicly
See What Is Listeningss -lntup | grep ':465 '
Test From Outsidenc -zv your-server 465
Block with UFWufw deny 465/tcp
Block with nftablesnft add rule inet filter input tcp dport 465 drop
SMTPS uses TCP port 465. Mail submission over implicit TLS, for mail clients sending through their server.
Needs authentication. Watch for compromised accounts sending spam through it.
Open port 465 only on servers that run SMTPS, and keep the software patched: public services are scanned within minutes of going online.
Other Ports
20 FTP Data21 FTP22 SSH23 Telnet25 SMTP53 DNS67 DHCP Server80 HTTP110 POP3123 NTP143 IMAP161 SNMP389 LDAP443 HTTPS445 SMB465 SMTPS514 Syslog587 Mail Submission853 DNS over TLS993 IMAPS995 POP3S1194 OpenVPN1433 Microsoft SQL Server1900 SSDP / UPnP2049 NFS2083 cPanel (SSL)2087 WHM (SSL)3306 MySQL / MariaDB3389 RDP3478 STUN / TURN5060 SIP5432 PostgreSQL5900 VNC6379 Redis8006 Proxmox VE8080 HTTP Alternate8443 HTTPS Alternate11211 Memcached25565 Minecraft27017 MongoDB51820 WireGuard
Questions
What is port 465 used for?
SMTPS. Mail submission over implicit TLS, for mail clients sending through their server.
Is it safe to open port 465?
Yes, if you run this service publicly. Needs authentication. Watch for compromised accounts sending spam through it.
How do I check if port 465 is open?
On the server, ss -lntup | grep ':465 ' shows what is listening. From another machine, nc -zv your-server 465 shows whether the firewall lets it through.
How do I block port 465?
With UFW: ufw deny 465/tcp. With nftables, add a drop rule for dport 465 in your input chain.
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