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All available email templates for the authenticated company are available here and are available for edit. Each template is available for edit in all installed languages, in both HTML and Text. Email templates support Conditional Statements, Loops, and Filters. Details and syntax for these are described under Template Parsing Customizing Emails.
Signatures
Signatures are snippets that appear at the bottom of an email and typically contain the contact information for the sender. Usually multiple email templates would use a single signature, so updating that signature is a simple process through the use of signatures. While editing an email template, a signature, or no signature may be selected.