Hello,
my brain is twisted as I tried all day to stop accepting mails with a
subject matching "Fw: ${local_part}_report.pdf" as I face an unwanted
wave of those mails.
As $local_part isn't available in system filters, I tried to workaround
this by storing a "suspicious" subject after RCPT TO and comparing it
with the subject after the DATA command:
acl_smtp_rcpt = acl_check_rcpt
acl_smtp_data = acl_check_data
...
begin acl
...
acl_check_rcpt:
accept hosts = +relay_from_hosts
control = submission
set acl_c0 = Fw: ${local_part}_report.pdf
acl_check_data:
deny condition = ${if eq {$header_subject}{$acl_c0} {1}{0}}
message = Bad Subject $header_subject
6287 processing "accept"
6287 check hosts = +relay_from_hosts
6287 check control = submission
6287 expanding: Fw: ${local_part}_report.pdf
6287 result: Fw: marco_report.pdf
6287 check set acl_c0 = Fw: ${local_part}_report.pdf
6287 = Fw: marco_report.pdf
6287 accept: condition test succeeded
...
6287 using ACL "acl_check_data"
6287 processing "deny"
6287 expanding: $header_subject}{$acl_c0} {1
6287 result: {1
6287 expanding: 0
6287 result: 0
6287 condition: eq {$header_subject}{$acl_c0} {1}{0}
6287 result: false
6287 expanding: ${if eq {$header_subject}{$acl_c0} {1}{0}}
6287 result:
6287 check condition = ${if eq {$header_subject}{$acl_c0} {1}{0}}
6287 =
6287 deny: condition test failed
What did I miss? The expansion in the DATA acl looks... strange? I tried
with exim 4.63 and 4.67, either versions work the same.
Thanks for any hint.
Kind regards
--
Marco
