The Case Sensitivity Email Mystery: How Capitalization Broke University Email Delivery

A systems administrator shares a memorable troubleshooting story about a university email system where the statistics department couldn't send emails to certain addresses. The problem turned out to be a subtle case sensitivity issue in email addresses - the department's email system was capitalizing the first letter of usernames in outgoing emails, which some receiving systems interpreted as different addresses. The solution involved understanding how different email systems handle case sensitivity in the local part of email addresses.