Curious—so if a dev applied for a job and had an AOL email address as their primary, would you find that odd? Certainly their choice of email—which they use many times every day—says more about them than what their favorite color is.
For example, it might say that they are security-conscious and don't trust Google/gmail. Or it might indicate that they take pride in being contrarian. So it could reveal something about the character/personality of the individual.
For the record, the question was whether we notice email addresses and have any sort of prejudices based on them. Hopefully none of us ends up making important decisions (hiring) based on choice of email provider!