Slow email

I sent an email to a colleague at another University, and after exactly half an hour received this warning:

This message was created automatically by mail delivery software.
A message that you sent has not yet been delivered to one or more of its recipients after more than 95016 hours on the queue on mrelay-e-ext.lmu.ac.uk.

I calculated that the delay was about 10.8 years, and was intrigued by the strange delay. I asked our own tech people and they thought it was rather funny, too, trying to deliver a message for almost 11 years - then they suggested that perhaps it was a bug in the system of the destination email server after the annual Summer time change. What kind of programmers or systems designers would forget that daylight saving time occurs every year?