Whoever is in charge of finding new hires will get a stack of 100+ resumes. They need to sort through and grab a handful of resumes they want to interview from. They most certainly are not got to interview every applicant that throws a resume their way. They need to divide the pile into yes, no, and maybes. If they get a big enough pile of "yes" then the maybes will not even make it to consideration.
First thing they do is skim for any spelling mistakes. If they find one, you're out of the pile. Giant block of text? You're out! Ugly font? You're out! In this preliminary sorting procedure, any bias that the sorter has will separate a yes from a maybe, or a maybe from a no.
Every detail counts. Sloppy, inappropriate, or antiquated email addresses that could cause the reviewer to twinge in any way will affect your changes of getting into the interview pile. If you want your best foot forward, this is just one of a number of things to avoid on a resume.