bounce_pattern — configure the pattern that inbound email addresses must match in order to be considered bounces.
Bounce_Pattern = "Perl-compatible regular expression"
When a message passed through the server bounces due to an in-band SMTP failure or is received out-of-band as a notification of failed delivery, this option will qualify the "original sending" email address as suitable for bounce classification and processing. For in-band bounces, the "original sending" email address is the envelope sender. For out-of-band delivery failures the "original sending" address is the envelope recipient. The ultimate behavior of bounce handling is dictated by the the
Bounce_Behavior configuration setting.
If you leave the
Bounce_Pattern setting unconfigured, then any mail to any of the
Bounce_Domains will be considered a bounce, and processed as such.
To treat all mails originally sent from an email address like firstname.lastname@example.org as eligible for bounce processing, you would specify:
Bounce_Domains = ( bounces.example.com ) Bounce_Pattern = "^bounces-\d+-\d+@"
bounce_pattern is valid in the domain and global scopes.