Crooked Timber | Email from Students :
[E]ven though universities give students email addresses, it's often the case that students won't use them. Instead they prefer their free hotmail or yahoo or gmail addresses. No problem as such there, except that sometimes the students pick the kind of addresses for themselves that aren't exactly professional-quality. Frankly it feels a bit odd to correspond with, e.g., missbitchy23 or WildcatBongs about letters of reference.
I'll never forget the time we got an email at work from
email@example.com. Clearly they're getting something from webmail that I'm not ;)