Probably, but it looks like a standard paragraph (body font), and it appears in the first column (of 2 column document), not as part of the heading section with title, etc.
-B From: firstname.lastname@example.org <email@example.com> On Behalf Of Paul A. Rubin Sent: fredag 6. april 2018 15.47 To: firstname.lastname@example.org Subject: Re: LyX & article style? On 04/06/2018 09:08 AM, Bernt Lie wrote: Great. What about Address field? -Bernt You can center it the same way you center any other paragraph (Edit > Paragraph settings ... or equivalent tool bar button), can't you? Paul