"Responsive emails = fluid grids, fluid media and media queries. The idea being where @media isn’t supported, you can fallback on a fluid layout. As fluid layouts pose issues on some desktop email clients, alternatively you can fallback to a fixed-width mobile template."
"while more than 50 percent of retailers plan to increase their email volume either slightly or significantly this Christmas-shopping season, just 21 percent have invested in segmenting technology in the last year, according to a survey by Bronto Software."
Responsive Design can make a webpage shrink or expand to the device it’s being viewed on instantly through the use of CSS3 @media queries in the HTML coding. Lately, however, much of the buzz is about applying these media queries within email code to generate responsive emails. There’s one giant catch that many articles of late seem to smooth over…
"A mathematician recently cracked Google’s weak 512-bit DKIM key and impersonated founders Sergey Brin and Larry Page via email. A recent Wired.com article relating the story started a rush in the email industry to create new DKIM keys stronger than 512-bits. Google is taking this security issue seriously by requiring all senders to sign with a 1024-bit DKIM key."