UPDATED: Allow selection to work against the same text as displayed in the "Who" column of the inbox. This is basically equal to the "display name" portion of an RFC822 formatted email address. See the column formula for exact value.
For Email in the RFC822 format "display name" <localpart@domainpart>
No action can be taken by a mail rule based on the display name. Yet there are cases where this is desirable.
For example, a helpdesk system may generate messages with the following format
"Help Desk (Bob Jones)" <email@example.com>
All messages will have the same address <firstname.lastname@example.org>, but who actually sent it is differentiated by the display name. I need the ability to create a rule to act on the contents of the display name. Currently that is not an option.
For more general information on RFC822 email format see this page: