Scottsdale-based GoDaddy won a long-standing legal battle in Phoenix that could affect similar patent infringement claims against other technology companies.

RPost Communications Ltd., the Los Angeles-based creator of the RMail secure and certified electronic communications company that also is a patent holding company, claimed GoDaddy’s email marketing product infringed on a broad patent regarding how email works, including how email bounces back when sent to an address that is no longer active.

Under the threat of a lawsuit from RPost, domain name register GoDaddy (NYSE: GDDY) instead decided to “take a stand” and filed its own lawsuit against RPost in January 2014.

GoDaddy’s legal team thought RPost’s patents were invalid because they were so broad. Arizona Federal Court Judge James Teilborg agreed with GoDaddy, granting a motion for summary judgment June 7 that said RPost’s patents were invalid and in turn, the issue was moot.

"GoDaddy believes that it is important to vigorously defend itself, and the industries in which it serves, against meritless patent claims, as was the case in this matter," said Nima Kelly, GoDaddy executive vice president and general counsel, in an email. "We are pleased with the court’s decision showing that the asserted patent claims are invalid and should not be enforced against GoDaddy or anyone else."

"By invalidating these patents it’s a considerable ruling because it not only allows GoDaddy to operate but it allows other companies in the email marketing space to avoid these RPost patents," LaCorte said.

RPost has sued dozens of other large tech companies—including Amazon, Adobe and eBay/PayPal—and has many active similar lawsuits involving these patents. It is in active litigation against tech companies such as Epsilon, Experian, StrongMail, Docusign and Symantec.

The GoDaddy judgment striking down these patents could impact the ongoing cases, and may influence other tech companies to proactively address potential patent infringement claims instead of waiting to be sued.

"This took a lot of perseverance and diligence," LaCorte said. "This costs large and small companies a lot of money. At some point, you stand firm and say you’re not going to pay. GoDaddy took a stand and the judge gave good guidance."