mail alias on domain alias does not work
## Summary
email to an aliased email on an aliased domain does not work
## Steps to reproduce
1. have an email alice@example.com
2. have an email alias bob@example.com => alice@example.com
3. have a domain alias @alternate.com => @example.com
4. Try to send an email to bob@alternate.com
5. 550 5.1.1 <bob@alternate.com>: Recipient address rejected: User unknown in virtual alias table;
## Correct behaviour
Mail to be send to alice@example.com
## Environment
Debian 11
ISPConfig Version: 3.2.9p1
Apache2.4
## Proposed fix
See the patched query entry in /etc/postfix/mysql-virtual_forwardings.cf
#> postmap -q "bob@alternate.com" mysql:/etc/postfix/mysql-virtual_forwardings.cf
alice@example.com
```
query = SELECT s.destination AS target FROM mail_forwarding AS s
WHERE (s.source = '%s' OR s.source = CONCAT(SUBSTRING_INDEX('%u', '+', 1), '@%d'))
AND s.type IN ('alias', 'forward') AND s.active = 'y' AND s.server_id = 1
UNION
SELECT s.destination AS target FROM mail_forwarding AS s
WHERE s.source = '@%d' AND s.type = 'catchall'
AND s.active = 'y' AND s.server_id = 1
AND NOT EXISTS (
SELECT email FROM mail_user
WHERE (email = '%s' OR email = CONCAT(SUBSTRING_INDEX('%u', '+', 1), '@%d'))
AND EXISTS (
SELECT domain_id FROM mail_domain
WHERE domain = SUBSTRING_INDEX('%s', '@', -1)
AND active = 'y' AND server_id = 1
)
AND server_id = 1
)
AND NOT EXISTS (
SELECT source FROM mail_forwarding
WHERE (source = '%s' OR source = CONCAT(SUBSTRING_INDEX('%u', '+', 1), '@%d'))
AND active = 'y' AND server_id = 1
)
UNION
SELECT s.destination AS target FROM mail_forwarding AS s
INNER JOIN mail_forwarding AS s2
ON ( s2.source = '@%d'
AND s2.type = 'aliasdomain'
AND s2.active = 'y'
AND s2.server_id = 1)
WHERE (s.source = CONCAT(SUBSTRING_INDEX('%u', '+', 1), s2.destination))
AND s.type IN ('alias', 'forward')
AND s.active = 'y'
AND s.server_id = 1
```
PS: This settings (multiple alias) was working under ISPConfig Version: 3.1.12
issue