// If set, only send mails to addresses listed there.
// format of entries: one entry per line. Either an email address directly, or a regular expression,
// prefixed by "RE:". Examples: "jane.doe@domain.com" or "RE:jane[^@]@domain.com", where the first will
// If set, only send mails to addresses listed there.
// format of entries: one entry per line. Either an email address directly, or a regular expression,
// prefixed by "RE:". Examples: "jane.doe@domain.com" or "RE:jane[^@]@domain.com", where the first will