3 ms·Not if the receiving smtp server implements DMARCby baudehlo 11y agoNot if the receiving smtp server implements DMARCStavrosK 11y agoIs DMARC like HSTS for SMTP?deleted 11y ago[deleted]fanf2 11y agoDMARC doesn't have a STARTTLS policy. I think you mean DANE / TLSA.tptacek 11y agoIn which case you're conceding security to governments anyways.baudehlo 11y agoSorry Tony, you're absolutely right. Got my acronyms wrong. Thank you :) (The parent is Tony Finch, a very smart email guy who runs email for the university of Cambridge)