Sender login maps: which MAIL FROM addresses an authenticated user
may use.
A user may send as their login (when it is an address), and as any
address matching a pattern for their login in auth.senders or in the
database (sovitectl user sender add). A pattern is a full address,
@domain for every address at the domain, or * for any address. The
null sender (MAIL FROM:<>) is always allowed. Comparisons ignore
case.
Summary
Functions
Returns whether login may send as sender, given its patterns.
Returns whether pattern is a valid sender pattern.