signature rule

A signature rule is a condition you set on a signature template in Exclaimer that decides whether the signature is applied to a given email. Rules are evaluated against each enabled signature in processing order; the first signature whose rules all pass is applied, and Exclaimer stops walking the list.

Each signature has rules across five tabs: Senders (which mailboxes can send it), Exceptions (which mailboxes are excluded), Recipients (internal, external, or specific addresses), Date/Time (active windows), and Advanced Rules (server-side only). Folder rules are evaluated before the rules on each signature inside the folder; a folder Senders rule that excludes a user means no signature in that folder applies to them, regardless of what the signature’s own rules say.