smtp

Managing SMTP Port: Block, Unblock, and Change SMTP Port

Blocking the SMTP port (typically port 25) can help prevent unauthorized email sending, reduce spam, or stop malware from exfiltrating data via email.

Syntax

smtp <block>
     <unblock>
     <25>
     <26>

Examples

To block a GoPanel server from sending outgoing emails
$ /go/smtp block

To unblock SMTP and allow outgoing emails
$ /go/smtp unblock

Changing the default SMTP port from 25 to 26
$ /go/smtp 26

To restore the default SMTP port (25) and disable port 26
$ /go/smtp 25

Related GoPanel commands

blacklist - Block Blacklist IPs (Bad Bots and SSH Brute Force Attacks)
block - Block an IP address in GoPanel Server
checkfirewall - Verify and ensure that important required ports are open on your GoPanel server
checkimap - Check the IMAP port and SSL certificate
checkmail - Check if your server provider supports mail port 25 (SMTP)
checkmx - Check MX Priority Range for All Domains
checksmtp - Check the SMTP port and SSL certificate
firewall - Install a firewall on a GoPanel Server
mailssl - Installi SSL Certificates for SMTP and IMAP in GoPanel
reversedns - Check Reverse DNS (rDNS) in GoPanel
smtplimit - Limiting Outgoing SMTP Emails per Email Address
unblock - Unblock an IP address in GoPanel Server
waf - Block IPs via Cloudflare WAF

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