According to Huffington Post Canada, Carlos sent the email because he didn't want Nicole to think he was a "bad guy who didn't text back."
As well as hundreds of students, his message also found its way to professors called Nicole or with similar names.
And the Nicoles quickly started emailing back and forth, according to Masters Psychology student Nicole Macmillan.
"Somebody responded only to the Nicoles and the group and said, 'Should we all tell him that we're his Nicole, all 250 of us?'. And then it just blew up from there."
Speaking of their meet up the next day, she added: "It was so freaky because we showed up to have a drink and we all kind weirdly looked alike. It was really strange."
The story had a happy ending when word reached the real Nicole on social media via the network of namesakes.
As she's an exchange student she didn't have a University of Calgary email address.
"I'm the exchange student from Holland who got brought home by Carlos last night and thinks that Nietzsche is quite depressing. Don't have an u of c email so didn't get the beautiful email myself, but the powerful Nicoles helped me get in touch.
"Would love to meet all of you sometime in the future."