Mail is under Office then Mail, when your plan includes this module. An outgoing letter goes from draft to awaiting signature, then signed, then sent; only a draft or a letter awaiting signature can be changed.
Letterhead and signatories are set in Administration, Organization, then Letterhead: a header composed by MAYA, an image of your paper (5 MB at most), or none for pre-printed paper.
Only the designated signatory approves a letter, from their own account, and must have approved it before it is sent. Their signature or stamp is only printed in that case: a letter approved by someone else goes out without the image.
An entity with no signatory cannot issue a letter to sign: an administrator designates one on the letterhead screen.
PlansIncluded in every plan.