To Whom it may Concern:
Many organizations choose to run their email through Office 365 (Microsoft) or Google Apps for Business and host their website on a separate server. The benefit of using an external mail server is the web server can go offline and your email will continue working. Google and Microsoft also tend to have better spam filters.
However, based on my personal experience, I’ve seen a good number of area businesses, government entities, and similar organizations using their @ptd.net email accounts for official business.
For the ultra security conscious, we recommend an email service like Protonmail (Switzerland) or Tutanota (Germany), mainly because they are overseas - therefore not subject to US privacy laws.
Nate Covington, Owner
Covington Creations, LLC (a Pocono Web Design & Development Company)