- Plesk 12.5 for Linux
- Plesk 11.x for Windows
- Plesk 12.5 for Windows
Emails bounced back with the following delivery failure description:
MailEnable: Message could not be delivered to some recipients.
Reason: Remote SMTP Server Returned: 450 4.7.1 Client host rejected: cannot find your hostname
Check the "Default mail domain name" setup in MailEnable:
Open MailEnable Management > Servers > localhost > connectors > SMTP > right click to open Properties .
Switch to the General tab > check "Default mail domain name", say you have the
Make sure that the
mail.mydomain.comcan be reversed correctly. Do the following test:
> nslookup mydomain.com
> nslookup A.B.C.D
E.F.G.I.in-addr.arpa name = ns1.otherdomain.com
Authoritative answers can be found.
> ping ns1.otherdomain.com
ping: unknown host ns1.otherdomain.com
The output above shows that host IP reverse lookup test fails.
This test checks all the local machine's TCP/IP addresses for reverse DNS lookup. Some mail servers perform a reverse lookup on you IP address. You need to ensure that external IP addresses facilitate a reverse lookup or mail servers (like Yahoo and Hotmail) will reject your mail.
Additionally please run the
"%plesk_dir%\\Mail Servers\\Mail Enable\\Bin\\MEDIAG.exe"- tool that will show you the diagnostic report. This utility is designed to assist you in configuring MailEnable. It validates your configuration and assists you in configuring MailEnable services.