Emails not getting to destination

I just setup RT on Debian. It is sending emails and I am getting them on my
own domain. I run a mail server and saw that it received it and accepted it
only because it was from the internal network (trusted IP). When emails are
sent to other domains, they are not received. I don’t know for what reason,
but I can guess that they are being rejected because they are not coming

Thanks,

Kyle Manuel, Net+
President/CEO
MBros Tech
kyle@mbrostech.com
PH: 225.709.4406
FX: 225.709.4404