Hello,

I have a domain with the MX pointing to my mail server's FQDN. All my emailing is working fine, except for the thing that if i try to send mail from my domain to any other domain hosted also on that box... I get the error:

550-Verification failed for

Any ideas why this is happening?

If I send mail to my domain from any other domain, it works just fine.

Thanks in advance

Check your DNS settings
Check your /etc/hosts files
Check your /etc/resolve.conf file
Make sure that if you NOT using phpsuexec that the option in tweaks, the one that says, prevent users from sending out mail as nobody is Unchecked.

check the /etc/localdomains file