Problem with sending emails from php scripts - HELP!

Hi!

I have dedicated server that is hardened.
Problem is that many of php scripts installed do not send emails, nor for signups or from contact forms.

I checked Email statistics thru WHM root, and there are errors like this:

3 zlajo@gmail.com F= R=fail_remote_domains:
unrouteable mail domain "gmail.com"

or

1 wildseven@terra-bit.com F=
R=fail_remote_domains: unrouteable mail domain "terra-bit.com"


How can gmail be unroutable?
Does anybody have solution for that?

Server runs on trustix 2.2 and cpanel/whm

Thanks
jailbird2

 

 

 

 

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