Have to add 0.0.0.0/0 to "Accept SMTP relays only from these"?

To reach the server via vpn I had to add a virtual IP (192.168.1.1) to the ethernet port. Since then mail acts a bit strange: I have to add 0.0.0.0/0 to "Accept SMTP relays only from these" in SA. Otherwise i get a "[/var/imap/socket/lmtp]: Connection refused" in the smtp log and the server does not accept any delivery of mails from the internets.
I'm not quite sure if it's a good idea. Can anyone please tell if this is still a security risk (while having access restrictions on the mail service)?

After a few telnet tests I can answer my own question: It makes an open relay server to spammers! But to solve the former issue with the connection refuse, I had to switch to virtual hosting in the advanced tab of the mail service and add my own domains.

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