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Topic: SMTP ERROR while sending email

SMTP Error (451): Failed to add recipient "aamralkar@zarca.com" (4.3.5 Server configuration problem)

Getting this error while sending email from RoundCube what could be the problem.

I am on Debina 6 and iredmail 7

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Re: SMTP ERROR while sending email

Please check postfix maillog first. If you are not sure what it means, paste here so that others can help troubleshoot.

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Re: SMTP ERROR while sending email

Apr  1 08:32:05 mail postfix/smtpd[2390]: NOQUEUE: reject: RCPT from unknown[192.168.1.233]: 451 4.3.5 Server configuration problem; from=<bounce@zarca-inc.com> to=<aamralkar@k12insight-inc.com> proto=ESMTP helo=<mail.zarca-inc.com>

This is what I am getting

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Re: SMTP ERROR while sending email

Could you please paste logs before this line?