Over the last three days or so messages sent to Gmail and Verizon accounts come back with the “could not send message for past 4 hours” warnings.  Unfortunately this happens after four hours, resulting in some fun times of 
“I sent you an email”
“No you didn’t”
“It’s in my sent mail folder”
“Well I did not receive it”

Based on previous discussions on IT-Discuss it appears this is a problem on the UVM side?

Jarlath O'Neil-Dunne
University of Vermont  |  Spatial Analysis Laboratory