What option should I take, we can send emails to that account with all nameservers located on my ISPConfig box but non externals.
Here is the error that I got when am trying to send one out:
This is the Postfix program at host morticia.educandote.net.
I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.
For further assistance, please send mail to <postmaster>
If you do so, please include this problem report. You can
delete your own text from the attached returned message.
The Postfix program
<firstname.lastname@example.org>: host smtp.dinanet.net.co[18.104.22.168] said: 550
<email@example.com>: Sender address rejected: Domain not found (in
reply to RCPT TO command)
What else can be done!!