mail to a different server help

Help I am trying to have mail go to a clients inhouse mail server
using its IP address: xxx.xxx.xxx.xxx.

I set up the zone file to look like this:
domain.com | 14400 | NS | saturn.robustserver.com
domain.com | 14400 | NS | satrund
domain.com |14400| A | SERVER IP
localhost.domain.com | 14400 | A | 127.0.0.1
domain.com | 14400 | MX | 0 | domain.com
mail | 14400 | A | xxx.xxx.xxx.xxx

set up like this it bounced emails back with the following:
<email@domain.com>: host domain.com[SERVER IP] said: 550-"The
recipient cannot be verified. Please check all recipients of this 550
message to verify they are valid." (in reply to RCPT TO command)

So I tried adding the following:
mail.domain.com | 14400 | A | xxx.xxx.xxx.xxx

Now it returns this error:
<email@domain.com>: host domain.com[SERVERIP] said:
550-mailserver.whatever[IP] is currently not permitted to relay
550-through this server. Perhaps you have not logged into the pop/imap
server 550-in the last 30 minutes or do not have SMTP Authentication turned
on in your 550 email client. (in reply to RCPT TO command)

 

 

 

 

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