Email Sending Issues

[newmember]

Newbie trying to manage many moving parts.
Here are the errors I am getting (see below)

www-data: apache process user name
server-isp.local: host name of the server
192.168.0.33: mail relay for the office
[email protected]: I changed the domain of this address to protect the innocent, but this is the destination email address.

I went down the list testing each option, and they all failed with this error.

Thoughts please.
I think I have to fix the senders email address? But how?

Maybe someone wants to make this a support deal, and I can pay someone to work through this with me?

Thanks


6FC72782D9 Thu Sep 30 15:02:13 [email protected] [email protected] 890 bytes host 192.168.0.33[192.168.0.33] said: 450 4.1.8 <[email protected]>: Sender address rejected: Domain not found (in reply to RCPT TO command)
8CBEC782D3 Thu Sep 30 15:16:37 [email protected] [email protected] 887 bytes host 192.168.0.33[192.168.0.33] said: 450 4.1.8 <[email protected]>: Sender address rejected: Domain not found (in reply to RCPT TO command)
9CAB8782DE Thu Sep 30 15:03:34 [email protected] [email protected] 919 bytes host 192.168.0.33[192.168.0.33] said: 450 4.1.8 <[email protected]>: Sender address rejected: Domain not found (in reply to RCPT TO command)
A6D24782DB Thu Sep 30 15:18:13 [email protected] [email protected] 908 bytes host 192.168.0.33[192.168.0.33] said: 450 4.1.8 <[email protected]>: Sender address rejected: Domain not found (in reply to RCPT TO command)
ACA81782DF Thu Sep 30 15:06:00 [email protected] [email protected] 894 bytes host 192.168.0.33[192.168.0.33] said: 450 4.1.8 <[email protected]>: Sender address rejected: Domain not found (in reply to RCPT TO command)
C00D0782DC Thu Sep 30 15:00:09 [email protected] [email protected] 892 bytes host 192.168.0.33[192.168.0.33] said: 450 4.1.8 <[email protected]>: Sender address rejected: Domain not found (in reply to RCPT TO command)

[DrByte]

The message means what it says. The server-isp.local doesn't recognize the domain name of the sender email address.
One could interpret it more specifically that the domain name (domain.com) of the email address ([email protected]) does not exist on the server being asked to accept the outgoing email request (server-isp.local).

This smells of a webserver configuration problem, not a Zen Cart problem.