Notary quote MTA option

Notification message MTA options:  (1-127)
The  MTA option  specifies the ASCII representation of the character that  marks substitution sequences in     files and    files. It defaults to 25 (the ASCII position of the percent character) so  substitutions are ,  , etc., as listed in  return_&#x2a;.txt file substitution  sequences.

See also:
 * Notification message MTA options
 * Notification messages
 * The required full set of DSN type-specific return_...txt files
 * The disposition_...txt files
 * File format MTA options