mailto.conf - configuration file for cups email notifier
The mailto.conf file defines the local mail server and
    email notification preferences for CUPS.
Each line in the file can be a configuration directive, a blank
    line, or a comment. Configuration directives typically consist of a name and
    zero or more values separated by whitespace. The configuration directive
    name and values are case-insensitive. Comment lines start with the #
    character.
  - Cc
    cc-address@domain.com
- Specifies an additional recipient for all email notifications.
- From
    from-address@domain.com
- Specifies the sender of email notifications.
- Sendmail
    sendmail command and options
- Specifies the sendmail command to use when sending email notifications.
      Only one Sendmail or SMTPServer line may be present in the
      mailto.conf file. If multiple lines are present, only the last one
      is used.
- SMTPServer
    servername
- Specifies a SMTP server to send email notifications to. Only one
      Sendmail or SMTPServer line may be present in the
      mailto.conf file. If multiple lines are present, only the last one
      is used.
- Subject
    subject-prefix
- Specifies a prefix string for the subject line of an email
    notification.
cupsd(8), CUPS Online Help (http://localhost:631/help)
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