On Sun, Aug 27, 2023 at 10:25:10AM +0200, lutz.niederer--- via Postfix-users
wrote:
> In postconf > smtpd_command_filter section there is an example for never
> bouncing mails (no DSN):
>
> # Bounce-never mail sink. Use notify_classes=bounce,resource,software
> # to send bounced mail to the postmaster (with message body removed).
> /^(RCPT\s+TO:\s*<.*>.*)\s+NOTIFY=\S+(.*)/ $1 NOTIFY=NEVER$2
> /^(RCPT\s+TO:.*)/ $1 NOTIFY=NEVER
>
> RFC3461 says
>
> notify-esmtp-value = "NEVER" / 1#notify-list-element
> notify-list-element = "SUCCESS" / "FAILURE" / "DELAY"
>
> Notes:
>
> a. Multiple notify-list-elements, separated by commas, MAY appear in
> a NOTIFY parameter; however, the NEVER keyword MUST appear by
> itself.
>
> Why is there a "$2" appended in the first line of the example if only "NEVER"
> is allowed?
Consider:
RCPT TO:<lu...@example.org> NOTIFY=SUCCESS SIZE=12345
taking into account that "\S+" greedily matches non-whitespace. [ The
"$2" suffix will necessarily be empty or will start with whitespace. ]
--
Viktor.
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