Brandon Grotesque, Helvetica Neue with Proxima Nova in action on litmus.com

Under the hood

.header-1 { font-family: brandon-grotesque, sans-serif; font-size: 18px; font-style: normal; font-weight: bold; letter-spacing: normal; line-height: 18px; text-transform: uppercase; color: #4E6769; }
.header-2 { font-family: proxima-nova, sans-serif; font-size: 30px; font-style: normal; font-weight: 500; letter-spacing: normal; line-height: 30px; text-transform: none; color: #FFFFFF; }
.content-1 { font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 15px; font-style: normal; font-weight: normal; letter-spacing: normal; line-height: 22px; text-transform: none; color: #606D6E; }
.content-2 { font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 14px; font-style: normal; font-weight: bold; letter-spacing: normal; line-height: 34px; text-transform: none; color: #FFFFFF; background-color: #DB612E; }