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catch-all addresses should not have precedence over mail users

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Aliases have precedence over mail users. A catch-all address would grab mail intended for a mail user and send it elsewhere. This adds some SQL hackery to create dummy aliases for all mail users.

fixes #200
closes #214 another way
This commit is contained in:
Joshua Tauberer 2014-09-27 11:39:50 +00:00
parent a4c70f7a92
commit 698ae03505
1 changed files with 8 additions and 1 deletions
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9
setup/mail-users.sh
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@ -93,9 +93,16 @@ query = SELECT 1 FROM users WHERE email='%s'
EOF
# SQL statement to rewrite an email address if an alias is present.
# Aliases have precedence over users, but that's counter-intuitive for
# catch-all aliases ("@domain.com") which should *not* catch mail users.
# To fix this, not only query the aliases table but also the users
# table, i.e. turn users into aliases from themselves to themselves.
# If there is both an alias and a user for the same address either
# might be returned by the UNION, so the whole query is wrapped in
# another select that prioritizes the alias definition.
cat > /etc/postfix/virtual-alias-maps.cf << EOF;
dbpath=$db_path
query = SELECT destination FROM aliases WHERE source='%s'
query = SELECT destination from (SELECT destination, 0 as priority FROM aliases WHERE source='%s' UNION SELECT email as destination, 1 as priority FROM users WHERE email='%s') ORDER BY priority LIMIT 1;
EOF
# Restart Services