When sending email from 7.9.4 the Display name does not display for the recipient of the email, e.g. When sending a message from Joe Bloggs joe.bloggs@big.com, the recipient only sees joe.bloggs@big.com
However, if you send a test message from suitecrm, the display name is displayed for the recipient as per normal practice, e.g. when sending test message the recipient sees Joe Bloggs in the From field.