I've noticed recently that when you send an email via Actions->Send Email, it does not show as being from the address you are logged in with or the one you choose from the drop-down. Instead it always comes from the same address (presumably one that is configured globally somewhere).
The reply-to address is correct, but the from address is not.
There is nothing in the bug tracker about it. Is anyone else having this problem? I have not consciously changed any email settigs... I'm on civi 4.7.22 on Drupal.