USPS's Employee Email Address Formats

USPS uses 5 email formats, with first '.' last (ex. john.smith@usps.com)
being used 7% of the time.
first_initial lastjsmith@usps.com3%
lastsmith@usps.com1%
first lastjohnsmith@usps.com2%
first '.' lastjohn.smith@usps.com7%
other_templateother_template@usps.com87%