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improve inline documentation for the virtual-alias-maps query

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Joshua Tauberer 2015-06-21 08:22:11 -04:00
parent ce17c12ca2
commit 6a9eb4e367
1 changed files with 17 additions and 5 deletions
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22
setup/mail-users.sh
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@ -92,13 +92,25 @@ query = SELECT 1 FROM users WHERE email='%s'
EOF EOF
# SQL statement to rewrite an email address if an alias is present. # 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. # Postfix makes multiple queries for each incoming mail. It first
# To fix this, not only query the aliases table but also the users # queries the whole email address, then just the user part in certain
# table, i.e. turn users into aliases from themselves to themselves. # locally-directed cases (but we don't use this), then just `@`+the
# domain part. The first query that returns something wins. See
# http://www.postfix.org/virtual.5.html.
#
# virtual-alias-maps has precedence over virtual-mailbox-maps, but
# we don't want catch-alls and domain aliases to catch mail for users
# that have been defined on those domains. To fix this, we not only
# query the aliases table but also the users table when resolving
# aliases, i.e. we turn users into aliases from themselves to
# themselves. That means users will match in postfix's first query
# before postfix gets to the third query for catch-alls/domain alises.
#
# If there is both an alias and a user for the same address either # 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 # might be returned by the UNION, so the whole query is wrapped in
# another select that prioritizes the alias definition. # another select that prioritizes the alias definition to preserve
# postfix's preference for aliases for whole email addresses.
cat > /etc/postfix/virtual-alias-maps.cf << EOF; cat > /etc/postfix/virtual-alias-maps.cf << EOF;
dbpath=$db_path dbpath=$db_path
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; 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;