Requesting SMTP Relaying for sending unauthenticated email
An SMTP relay is used for sending unauthenticated email. SMTP relaying is necessary when you need to send email programmatically to recipients that are off-campus and the list of recipients may not be known before the email is generated. To submit a request, fill out the form below.
What is SMTP Relay?
An SMTP relay allows Campus users to programmatically send mail from their applications to their target users without having to run their own mail server. Common uses range from servers that may generate high volumes of mail to low volume printers, scanners and multifunction devices. This service can be used where a smart-host is required. This can be used to send mail to both campus and non-campus mail addresses. This service is insulated from spammers by maintaining a table of IPs allowed to relay.
Office 365 / WiscMail / WiscMail Plus customers may not need an SMTP relay in all cases. If you are a WiscMail Plus administrator, please see the following guide to help determine what option is best for your needs: Office 365 - Options for Individual and Programmatic Sending
Submitting a Request
To submit a request for a new SMTP relay or to change an existing SMTP relay, fill out SMTP Relaying request form at https://email.wisc.edu/admin/index.php?action=request-relay.
Filling Out the Form
IP(s) to Allow:
A comma-separated list of IP addresses that will be sending mail to smtp.wiscmail.wisc.edu or relay.mail.wisc.edu. These IP addresses must be static IPs and they should not come from a workstation or endpoint.
Spam Prevention Measures in Place:
Check this box if you can ensure that incoming mail will never include spam or be used by automated spammers. For example, if the email being sent is generated by a web form, is the form protected by authentication or a captcha?
Note: If you are unsure, leave this box unchecked. We will contact you to discuss in greater detail.
Identify what type of device is generating the email. Examples include copiers, scanners, web forms, or an application.
IP(s) to Remove:
If this request modifies or removes an existing SMTP relay request, please include the IP address(es) that you would like removed here. Please provide details in the "Intended Use" field.
Briefly explain how this SMTP relay will be used. Include any additional details or notes in this field.
Once your IP is allowed to relay, you may use the following configuration to relay email.
- SMTP Server: relay.mail.wisc.edu or smtp.wiscmail.wisc.edu
- SMTP Port: 25
- Id/Password: This is not used. Please leave blank.
- TLS/SSL: This is not used.
Important: You must enter a valid From address. This address can be a firstname.lastname@example.org or email@example.com account.
What is the difference between relay.mail.wisc.edu and smtp.wiscmail.wisc.edu
Both relay.mail.wisc.edu and smtp.wiscmail.wisc.edu will allow you to relay mail if your IP is listed in the WiscMail Relay table. relay.mail.wisc.edu is a newer service, which is set up to emit traffic on an alternate set of IPs separate from the traffic being sent by end-user accounts. The reputation of the email traffic relaying through relay.mail.wisc.edu will be better, which should result in a higher likelihood of messages arriving in Inboxes of the remote email services. Unlike smtp.wiscmail.wisc.edu the IP address of the device sending email must be included in the WiscMail Relay table in order to use relay.mail.wisc.edu. This is true even if the email is being sent exclusively to O365/WiscList addresses
If you have any questions or would like to discuss relaying options, please contact firstname.lastname@example.org.