Haven't come across these guys before…
Exactag[.]com being used as the URL in phishing/malware emails I've seen over the last 24 hours. Email is pretending to be a Microsoft Office 365 mail delivery report. Sample Below.
Google says “the Exactag platform allows you to reshape and future-proof your measurement through unique data collection and cutting-edge algorithms.” Which I think in simpler terms translates to ‘a place where malicious actors can hide their malicious URLs’