| ISP | SMTP Server |
|---|---|
| ABC Net | mail.hkabc.net |
| CTI | smtp3.ctimail3.com |
| HGC | mail.on-nets.com |
| HKBN | smtpo.hkbn.net |
| HKC | smtp.hkcmail.com |
| HKNet | smtp.hknet.com |
| I-Cable | smtp.i-cable.com |
| iSmart | smtp.ismart.net |
| NET Front | mail.netfront.net |
| Netvigator | mail.netvigator.com, corpmail1.netvigator.com |
| OneBB | smtp.onebb.net |
| Pacific Supernet | smtp.pacific.net.hk |
| So-net | smtp.so-net.com.hk |