Zix Corp., an email encryption services company, has leased 6,339 square feet in Burlington.

Dallas, Texas-based Zix Corp. will expand and relocate at 67 South Bedford St. in Burlington.

"After analyzing various options, our needs for immediate expansion were best met in our current facility," said Mike McCarthy, vice president at NAI Hunneman. "We’re pleased that that we were able to roll our client’s existing obligations into an agreement which satisfies all of our future needs."

Jason Levendusky of CB Richard Ellis represented the landlord, INVESCO.