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Add sender rewriting scheme (SRS).

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This commit is contained in:
iburadempa 2020-09-12 13:58:52 +02:00
parent f24ce8295d
commit 43fd2da518
4 changed files with 116 additions and 15 deletions
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39
mail_system/templates/postfix/recipient_canonical_maps.cf
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@ -1,5 +1,11 @@
# THIS FILE IS CONTROLLED BY ANSIBLE - DO NOT CHANGE IN DEPLOYMENT!
# Rewrite (envelope and header) recipient addresses:
# - if the recipient address has a local domain and does
# not begin with SRS0 or SRS1, then strip our verp_marker
# - if the recipient address has a local domain and does
# begin with SRS0 or SRS1, try to extract our srs_id
# and lookup the corresponding original address
# man pgsql_table
@ -7,4 +13,35 @@ user = {{ mailserver.postgresql.username }}
password = {{ mailserver.postgresql.password }}
dbname = {{ mailserver.postgresql.dbname }}
hosts = {{ mailserver.postgresql.host }}
query = select regexp_replace('%s', '\+(.*){{ mailserver.postfix.verp_marker }}-\d+@', '+\1@')
query =
with
mydomains as (select regexp_replace('%s', '.*@([^@]+)$', '\1') in (select name from domains) v),
srs0 as (select lower(substr('%s', 1, 4)) = 'srs0' v),
srs1 as (select lower(substr('%s', 1, 4)) = 'srs1' v)
select
case
when mydomains.v and not srs0.v and not srs1.v
then regexp_replace('%s', '^(.*)\+{{ mailserver.postfix.verp_marker }}-\d+@', '\1@')
else
case
when mydomains.v
then
case
when srs0.v
then
case
when '%s' ~* '^SRS0=\d+@[^@]+$'
then (select original from mail_from
where srs_id = regexp_replace('%s', '^.....(\d+)@[^@]+$', '\1')::bigint
and original<>rewritten)
else '%s'
end
else (with t2 as (select regexp_replace('%s', '^(.*)@[^@]+$', '\1') v)
select original from mail_from, t2
where lower(substr(rewritten, 1, length(t2.v))) = lower(t2.v)
and lower(substr(original, 1, 4)) = 'srs0')
end
else '%s'
end
end
from mydomains, srs0, srs1