You can also email test-help AT a16z DOT com and we can send you a direct link (where you won't need to receive credentials by phone)

I love that people do this. Do you really thing someone is going to write a web scraper and NOT include obvious things like converting AT -> @ and DOT com -> .com?

Also, who even worries about spam any more? I haven't seen actual spam in my inbox in years.

Should we just go "AT AT AT" or something instead? Or perhaps adapt from Mandarin speakers, who literally call the @ sign "the little mouse" ;)

Spam remains an issue if for whatever reason you're still using rulesets/blacklists/greylisting and the like, instead of Bayesian filtering.

Did you include the country code prefix? Otherwise please try emailing vivek at hackerrank dot com with the bug to see if he can reproduce.