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Mail servers frequently use specific ports per type of connection, however, technically any port can be used. Your system administrator should this information:
| Port | Protocol | Purpose | Certificate |
|---|---|---|---|
| 25 | SMTP | Plain Text | no |
| 465 | SMTPS (Implicit SSL) | SMTP over SSL | yes |
| 587 / 2525 | SMTP (Explicit SSL) | SMTP over TLS | yes |
Below examples check availability of port 587, however, any port can be used:
| Code Block | ||||
|---|---|---|---|---|
| ||||
# should telnet be available
telnet mail.example.com 587
# should nc or ncat be available
ncat -v -u mail.example.com 587
#
curl --ssl --url mail.example.com |
| Code Block | ||||
|---|---|---|---|---|
| ||||
Test-NetConnection -ComputerName mail.example.com -Port 587 |
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