E-mail notifications: Wanting to replace "wordpress" with "support" in "wor

Would anyone be able to explain how to replace the word "wordpress" in my e-mail notifications with a different name, like "support"? Right now incoming e-mails read "wordpress@gumpolen.com." I would like to have this address read "support@gumpolen.com."

Any help would be most appreciated.

Thank you for your time,