SMTP Servers

SMTP Servers

This is a technical page describing some of CUIT's mail services, mainly to provide information for campus IT groups. SMTP is the Simple Mail Transfer Protocol, the standard under which mail is transported on the Internet. Many applications that generate outgoing mail hand it off to an SMTP server that will handle the sometimes complex task of resolving addresses and transporting messages to the destination.


If you use LionMail, your SMTP server is

CUIT Exchange

If you configure Outlook to read email on the CUIT Exchange server, you do not need to enter the SMTP server. However, if you use a mobile device to read your email on the CUIT Exchange server, you need to use as the SMTP server name.


The main SMTP server cluster is handles outbound mail from other systems managed by CUIT, such as Courseworks, and Columbia's main web servers. requires SMTP authentication. requires either TLS encryption (port 587 or 25) or SSL encryption (port 465). TLS to port 587 is preferred. If you are connected through an off-campus service provider you may need to use port 587 to reach

Mail automatically generated by other kinds of devices or software is usually not handled on You should never store a username and password in software as a way to use Please see the next section about, and if you don't see how to accomplish what you need to do, please contact CUIT.


CUIT provides the system as an SMTP server for a wide array of devices and software that need an SMTP server to send mail. Mail is accepted by without SMTP authentication. The recipient address must end "" or "@" another domain hosted by CUIT. No special permission is needed to use Any host can connect to it. If you need to relay mail to outside addresses, please contact CUIT to make arrangements.

On the Morningside campus, you are not required to route outgoing mail through an SMTP server run by CUIT. The campus network is open. If your computer has mail transport software, it is allowed to send mail directly to the destination. The SMTP servers are provided for software and devices that need the assistance of a separate SMTP server. LOCALHOST If your application runs on a Linux or Solaris host run by CUIT, use the host's own SMTP server . Configure your application to connect to localhost (literally the word "localhost") at port 587.