Looking for a Zimbra Expert to resolve issues with zimbra server

Job ID: 34103917

Budget: $10 – $50 AUD

I was attempting to blacklist an IP for spam, but i seem to have broken the server,
Error when sending:

Message not sent; one or more addresses were not accepted.
Rejected addresses: abc <emailadress>
method: [unknown]
msg: Invalid address: abc <emailadress>. com.zimbra.cs.mailbox.MailSender$SafeSendFailedException: MESSAGE_NOT_DELIVERED; chained exception is: com.zimbra.cs.mailclient.smtp.InvalidRecipientException: RCPT failed: Invalid recipient emailadress: 451 4.3.5 <localhost[127.0.0.1]>: Client host rejected: Server configuration error
code: mail.SEND_ABORTED_ADDRESS_FAILURE
detail: soap:Sender
Related categories: System Admin Linux DNS CentOs Postfix