Warn before sending to external addresses
In a corporate environment it is very important we double check before sharing internal email threads with external users / customers.
Today we have to manually inspect the email recipients list, and this idea will be a big time saver and prevent mistakes.
David Beveridge commented
PLEASE add this.
Especially in light of the inability to turn off address suggestion/autocomplete -- erroneously sending emails to employees Jira or GItLab accounts as well as external recipients is a persistent problem for most organisations.
A warning (separate from the S/MIME not-in-directory warning) on sending-external is needed; as well as the ability to customise that list of non-warning-realms.
*AND* do something like Mac-Mail does and highlight all external realms in the address bar.