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Check SMTP Port 25 for outgoing and incoming traffic for Mail send out via SMTP or Sendmail (PHP)
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| # To check the port 25 , you can use: | |
| # netstat (TCP and UDP): | |
| netstat -plntu | grep ':25' | |
| # ss (TCP and UDP): | |
| ss -lntu | grep ':25' | |
| # nmap (TCP): | |
| nmap -sT -O localhost | grep 25 | |
| # lsof (TCP and UDP): | |
| lsof -i:25 | |
| # telnet | |
| telnet smtp.transip.email 25 | |
| Trying xxx.xxx.xxx | |
| Trying xx.xxx.xxx... | |
| telnet: Unable to connect to remote host: Connection refused |
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