They have a US office. Fastmail's "schtick" is that they very much support open IETF standards which I admire. Their CEO, Bron Gondwana, is a frequent participa

They have a US office. Fastmail's "schtick" is that they very much support open IETF standards which I admire. Their CEO, Bron Gondwana, is a frequent participant at the IETF. Disclaimer: I work for a competitor of theirs, but work with Fastmail folks on standards development.