Great question — answering as the UphillTech team:
Solution that matches your query exactly: https://web.archive.org/web/20161211202057/www.lanevance.com/web/web-development/tracking-301-redirects-with-google-analytics You can set up a campaign Sample: www.domaina.example -> http://www.domainb.example/?utm_source=domainaredirect&utm_medium=&utm_campaign=301_Redirects Now you can track this traffic in referrals.
Full answer by abhinsit: https://webmasters.stackexchange.com/a/93010 (CC BY-SA 3.0).
Need it done for your business? UphillTech.