University of Minnesota

Email Allowed/Denied Senders List Frequently Asked Questions

For assistance, call:
 (218) 281-8000
 (218) 726-8847
 (320) 589-6391
Twin Cities:
 (612) 301-4357

Q: What is a domain?

A: For the purposes of allowing or denying senders, the domain is the portion of the sender's email address after the '@'. Examples of domains:,,

Q: How can I add an address or domain to my allowed senders list?

A: There are three ways to add to your allowed senders list:

  • by granting an exception requested by the sender of blocked email
  • by clicking on the 'make an exception' link on your Blocked Incoming Email page
  • by entering a specific address or domain in the form on your Incoming Email controls page

Q: An address (or domain) is on my allowed senders list - why were they blocked?

A: All email is subject to virus scanning. Any email containing a known virus will be blocked, even if it is on your allowed senders list.

Q: How can I add an address or domain to my denied senders list?

A: You can add a specific address or domain to your denied senders list by using the form on your Incoming Email Controls page.

Q: How can I remove an address or domain from my allowed or denied senders list?

A: Locate the address or domain on your list, click on it to highlight it, press the 'remove' button.

Q: I've added an email address to my Denied Senders List, but I am still receiving email from that address. Why?

A: Either you are allowing ALL email (see next question), or the email address in question is NOT the actual return address. Blocking is performed based on the FROM value in the envelope of the message, which shows up in the "Return-Path:" message header, not on the value appearing in the "From:" message header. In most situations, these values match. Mailing lists are an example of where they will not match, as the return path generally will contain the name of the mailing list, and the "From:" will contain the sender.

Q: Can I block addresses if I am currently allowing ALL email?

A: Yes. When you select to allow ALL mail, the Allowed Senders List becomes irrelevant, but the Denied Senders List remains in effect.

Q: If I no longer want email from a mailing list, can I simply add the list name to my denied senders list?

A: No, you must unsubscribe from the mailing list.

Q: Can I block addresses from

A: No. Addresses from the University cannot be blocked. If you feel that you are being harassed by somebody with a address, contact

Q: Is there a limit to how many addresses or domains I can add to my allowed senders list or my denied senders list?

A: Yes. You may have a total of 30 addresses and/or domains on both your allowed senders list and your denied senders list.

Q: What if I want to block an entire domain except for a few particular senders?

A: Since the allowed senders list always overrides the denied senders list for any given sender address, you can set up refined criteria for allowing and denying senders.

For example: You want to deny all email from accounts except for two friends ( and On your Denied Senders List, add ''. On your Allowed Senders List, add '' and ''.

Q: What will happen if somebody on my denied senders list attempts to send me an email?

A: They will receive a notice that their email was not delivered. Within this notice is a link they can go to for more information. If they visit the link, they will be informed that the reason the message was not delivered is because you have chosen to not accept mail from their email address or domain. They are then given the option of requesting an exception from you.

Q: If I am using SpamAssassin filtering, will it be applied to users/domains which appear on my allowed senders list?

A: No. Filtering is turned off in this case.

Q: Whom can I contact if I have more questions?

A: See the OIT Help and Support site for contact information.

Copyright 2006-2010 Regents of the University of Minnesota
The University of Minnesota is an equal opportunity educator and employer.
Last modified: Tue Mar 9 17:12:39 CST 2010