A Hook Airmail script will be released today to deal with the following contingency as noted.
When Airmail returns a URL that lacks a domain name (as it sometimes does), Hook’s Copy Link commands will create links of the form airmail://… rather than th usual hook://mail/… . If Airmail returns a well-formed link, Hook will create a hook://mail link.
We have only encountered Airmail’s incomplete links when more than one instance of Airmail has been installed on the Mac.
CSA-Issue#3216