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http://bugs.exim.org/show_bug.cgi?id=1137
--- Comment #1 from Phil Pennock <pdp@???> 2011-08-23 04:30:19 ---
This could probably stand to be cleaned up, but it's a straight cut&paste from
my config file of the definition for $acl_m_core_sender, which handles what you
request, and more.
# For the sender address, handle:
# BATV PRVS: prvs=<ignore>=email
# ${sg{$sender_address_local_part}{\N^prvs=.+?=([^=]+)$\N}{\$1}}
# Yahoo Groups: sentto-<ignore-with:->-rcptlocal=rcptdomain@senderdomain
# nb: rcptdomain can contain hyphen, as can rcptlocal; can fix latter easily
# and can fix former if restrict to [0-9-]+? but let's keep it generic
# and accept whitelist-slip-through for varying $foo in $foo-$bar.
# ${sg{$sender_address_local_part}{\N^sentto-.+?-([^=-]+=[^=]+)$\N}{\$1}}
# Nanog: LISTNAME-bounces+USERID
# ${sg{$sender_address_local_part}{\N^([^+]+-bounces)\+.+$\N}{\$1}}
# Zsh / ezmlm: LISTNAME-return-NNNN-USER=DOMAIN
#
${sg{$sender_address_local_part}{\N(.+)-return-\d+-([^=-]+=[^=]+)$\N}{\$1-\$2}}
# Nested substitutions risk dropping too much, and get harder to read
warn set acl_m_core_sender = ${if or{\
{match {$sender_address_local_part}{\N^prvs=.+?=([^=]+)$\N}}\
{match
{$sender_address_local_part}{\N^sentto-.+?-([^=-]+=[^=]+)$\N}}\
{match
{$sender_address_local_part}{\N^([^+]+-bounces)\+.+$\N}}\
{match {$sender_address_local_part}{\N^(.+)-return-\d+-.+$\N}}\
}{$1}{$sender_address_local_part}}@$sender_address_domain
# SRS: note that there is - and # encoding in SRS; we ignore it, for purposes
of
# canonicalisation. See http://www.openspf.org/SRS for one spec, but note that
# there are variances.
warn condition = ${if match{$sender_address_local_part}{\N^SRS[01]\N}}
set acl_m_core_sender = ${if match {$sender_address_local_part}\
{\N^(?i)SRS[01][=+](?:[^=]+=){2}([^=]+)=(.+)$\N}\
{$2@$1}\
{$sender_address_local_part@$sender_address_domain}}
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