Email, unauthenticated SMTP for Campus printers, web services, etc...

This page contains information about outbound-relays (aka Express-SMTP), an email service for on-campus IP addresses.

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This SMTP server allows computers or devices in the campus IP network to send "outbound" email without authenticating, hence your device doesn't need a NetID and password to send email.  The device or service needs to be properly configured and have a campus IP or be connected to campus via the VPN service.

Who can use Outbound-Relays to send outgoing messages

Any computer, printer, web service or email client in the campus IP space can use Outbound-Relays to send outbound email messages.

Configure your on-campus printer or other device to use Outbound-Relays

Set up your device with these connection parameters:




requires an encrypted connection:


reply email address:  A valid, deliverable email address OR ''. (Email sent to no-reply is discarded by the email relays.)

Limits:   Since this is a shared resource on the campus, there is a limit of 50 connections per server and 100 messages per connection.

Configure a desktop email client to use Outbound-Relays to send outgoing messages

It is best to use the default configuration for Exchange/Outlook(faculty, staff, grads) and Google Apps (undergrads).  However, if your computer is on "campus only" then you can configure your client to use the express SMTP  by substituting for the outgoing email server.  See the email client instructions for specific instructions.

Keywords:Express-SMTP, on-campus, campus IP address, email, printer, web services, outbound relays   Doc ID:47888
Owner:Email Relays E.Group:University of Illinois Technology Services
Created:2015-03-02 16:59 CDTUpdated:2017-10-12 14:47 CDT
Sites:University of Illinois Technology Services
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