On the same day that Yesware filed a motion for declaratory judgment against RPost, the entity filed an infringement suit against the company naming Google, a customer of Yesware’s products, as co-defendant. The suit asserts three patents related to aspects of verified email delivery, including verifying email receipt, opening, and the content of a reply (8,161,104; 8,275,845; 8,468,198). Yesware’s declaratory action states that it has received two assertion letters from RPost, in late October and early November, alleging that Yesware’s email tracking service infringes the patents-in-suit. Google is also accused of infringing the patents in RPost’s suit based on its use of Yesware’s tracking services as a plugin for GMail. RPost has asserted two of the patents-in-suit in previous litigation but the ‘198 patent has not previously been used in litigation. All three patents were developed by RPost which sells a registered email service in addition to its patent assertion activities. The entity has filed more than 25 cases over the last few years, against companies including Adobe, Amazon, and DocuSign. 11/8, Eastern District of Texas, 2:13cv00953