Yes, eSuite.ca does block both inbound and outgoing access to port 25 (SMTP).
Does blocking outbound port 25 mean that eSuite.ca users must use an eSuite.ca Email address?
No, eSuite.ca customers may use any valid email address, but all mail must be sent via the eSuite.ca SMTP Servers
for more information please see our Server Settings Page.
Why does eSuite block SMTP Port 25?
There are a number of viruses that spread themselves around the internet by way of using SMTP (Port 25). eSuite
blocks this traffic to try and prevent the spreading of viruses to other users around the Internet.
Are any other ports being blocked by eSuite?
Yes, the ports below are blocked for incoming traffic to try and prevent the spread of known viruses as well
as to prevent the use of known software exploits.
| Blocked Port # | Reason |
| FTP TCP/21 | This protocol is used to move files from one machine to another around the internet eSuite blocks this port to try and prevent viruses from spreading. |
| SMTP TCP/25 | There are a number of viruses that spread themselves around the internet by way of using SMTP (Port 25). eSuite blocks this traffic to try and prevent the spreading of viruses to other users around the Internet. |
| HTTP TCP/80 | This protocol is used to display webcontent around the internet; however there are also known exploits in certain programs that can use the protocol to install viruses. eSuite blocks this port to try and prevent the infection of computers for its customers |
| Netbios 137-139 | Netbios is used for file and printer sharing. These ports are blocked to stop worms which spread via open file shares |
For additional support please contact eSuite.ca Support at 416-853-1000 opt. #1.
