uh oh my second ever support ticket at fastmail has been opened. but i think it's actually a bug in #ios18_1.
mail.app imap server settings don't allow me to use my fastmail username of emory at kvet dot ch. straight up says it's invalid. sending relay configuration (submission 587/tcp) is accepting that username fine so idk. i am going to see if i can force it with a profile.
i have a new #sMIME cert for my email addresses anyway!