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Oscar, I'd recommend getting a copy of the bounce message -- have them send it to your Hotmail/Gmail, etc. Error codes in the message may indicate the problem. There are also sites that maintain info on email blacklists for organizations that don't follow best practices for newsletters/advertising, have their server set as an open relay, etc. I used to run into this a lot dealing with an internal exchange server and outside clients -- 95% of the time it was an issue on the user's end such as sending large attachments, blacklisted organization due to bad practices on marketing/advertising via email, typos on email addresses, Outlook issues, etc, and 5% of the time an issue with the company that managed our spam filter. Example: http://www.mxtoolbox.com/blacklists.aspx Shaun Leininger, CCNA Information Technology Professional Department of Anthropology 517-884-0388 -----Original Message----- From: Oscar Castaneda [mailto:[log in to unmask]] Sent: Monday, May 14, 2012 10:02 AM To: [log in to unmask] Subject: [MSUNAG] blocked IPs? I have a customer that claims that her emails to our staff (with @msu.edu and @rsgis.msu.edu) addresses are bounced. She used to be able to email us all the time until about one week ago. Everybody else can email us fine. We have a decent traffic of email on daily basis. I am pretty convinced that the problem is particular to them. Nonetheless, I would like to have something more tangible to show them. I was wondering if I could find if they are being blocked from MSU. I remember in the past reading somewhere of IPs or blocks of IPs that would be blocked from MSU for security reasons. Is there a way of knowing what gets blocked from msu.edu? -- Oscar Castaņeda Remote Sensing & GIS Michigan State University