Postfix send mails from other than the specified IP

Hello;

I have a VPS with many websites and many additional IPs.

Some websites have there own dedicated IP addresses.

For each of this websites with dedicated IPs, in “mail options” → “email settings” → “Send outgoing email for domain from IP” I have it set to “Virtual server’s address (dedicated IP)”, but the mails from this domaines still get sent from other IPs, like another domain dedicated IP or sometimes a IPv6 IP, this makes google reject those emails.

Any idea how to solve this ?

Regards;

SYSTEM INFORMATION
OS type and version Debian Linux 11
Webmin version 2.105
Virtualmin version 7.9.0

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