cant send email from php using sendmail

Hi!

I have sendmail installed on my linode with the only purpose to use it for sending emails from PHP (i.e. wordpress comments to moderate).

But I cant receive anything :(

I have edited /etc/mail/local-host-names and put all my domains here.

And edited /etc/mail/relay-domains to put the same domains.

And finally edited /etc/mail/access and added a line with my linode ip address to allow RELAY.

But none of this makes the thing working :(

I also tried to look for a iptables issue, but even after doing an iptables -F to leave the firewall blank… I cant get this working.

Please, I need some help :roll:

PS. I'm using Debian lenny.