i have problem with my server zcs-5.0.11
unexisting user can send e-mail to me and i recieve it for example:
telnet mail.mydomain.com 25
Connected to mail.mydomain.com.
Escape character is '^]'.
220 mail.mydomain.com ESMTP Postfix
250 2.1.0 Ok
250 2.1.5 Ok
354 End data with <CR><LF>.<CR><LF>
250 2.0.0 Ok: queued as 685DD134228
i have user email@example.com
but i don't have user firstname.lastname@example.org
The ip from were i do the telnet is not relayed(i have relay only for localhost and server ip), also i set zimbra to ask for authentication without TLS.
In generaly server is not open relay because this problem is only for local domain, if i try to send to another domain it reject me.
Can i make some settings to check for valid sender from my domains, because i recieving many spams from nonexistent users in my domain for example "email@example.com"
May be my question is stuped but i realy need help.
Thanks in advance