Currently Being ModeratedFeb 8, 2013 9:10 AM (in response to picarda27)
Doesnt look like that test site is sending a proper helo.. your server is configured to reject anything but a fully qualified domain.
from your main.cf
smtpd_helo_restrictions = reject_invalid_helo_hostname reject_non_fqdn_helo_hostname
your server should block non fqdn. so this is probably an issue with that server you use for testing.
Not much more time to followup on this today.
f you want help with your smtp settings, you need to post your imap and smtp settings (as requested earlier)
I have no idea what settings you are using, so no way to help you.
You can post screenshots or type it out.
Also -are you on the same lan as your server?