What are 'Ports'?
Ports are endpoints used in computer networking; specific to programs or protocols. Their purpose is to identify as unique, applications and processes on a single device (computer, server, router, &c.) and enable a physical connection to transfer data.
Much like physical ports where ships can dock, networking-ports help data have a more specific location of where to go as well as what protocols/credentials are needed to do so (having a passport/license).
What Ports do I need set for mail?
Sending and receiving electronic mail uses very specific ports; in order for you to send and receive from your Email Client, you will need to make sure they are configured correctly. Listed as follows are Siteserver specific Protocols, Server Names and Ports.
(A note on SMTP: Default for most email clients is Port 25. Siteserver does allow access through this port, however, many providers - such as AT&T - block transmitting of data through Port 25. For this reason, we recommend using Port 587.)
If you have further questions, please look at our other Knowledge Base articles on how to configure specific Email Clients as well as definitions of IMAP and POP3. You can also refer to the article on Connecting Securely to learn how to use TLS and SSL when sending mail.
Should you need further assistance, please contact us at firstname.lastname@example.org.