The Case Sensitivity Email Mystery: How Capitalization Broke University Email Delivery
By
giancarlostoro
Toasted to a respectable shade. No regrets, no crumbs left.
Summary
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.
Key quotes
· 4 pulledI was working in a job running the campus email system some years ago when I got a call from the chairman of the statistics department.
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.
This is one of those problems that's obvious in retrospect but completely baffling when you first encounter it.
The story is slightly altered in order to protect the guilty, elide over irrelevant and boring details, and generally make the whole thing more entertaining.
See also https://ibiblio.org/harris/500milemail-faq.html
Comments URL: https://news.ycombinator.com/item?id=46805665
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