There are several reasons why mail sent to @umich.edu addresses might not reach the final destinations:
- Bad behavior by the sending host. This blocking is done at U-M's primary mail gateway for all mail going through that gateway.
- Optional spam blocking. Users may choose to have mail from known spam sources blocked. For more details, see Using the Do Not Spam List to Reduce Spam.
- Block Status Check
Use the Block Status Check tool to find out if a particular IP address, e-mail address, or domain is currently blocked.