# SMTP/IMAP/POP

| **Port**  | **Service**                                                                |
| --------- | -------------------------------------------------------------------------- |
| `TCP/25`  | SMTP Unencrypted                                                           |
| `TCP/143` | IMAP4 Unencrypted                                                          |
| `TCP/110` | POP3 Unencrypted                                                           |
| `TCP/465` | SMTP Encrypted                                                             |
| `TCP/587` | SMTP Encrypted/[STARTTLS](https://en.wikipedia.org/wiki/Opportunistic_TLS) |
| `TCP/993` | IMAP4 Encrypted                                                            |
| `TCP/995` | POP3 Encrypted                                                             |
