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Postfix will not relay email  to other domains through our smtp service

Asked by PlazaProp in Postfix, SendMail Email Server, Linux Administration

Tags: postfix, linux, sendmail

I have linux box that monitors the network and needs to be able to send out emails.  The monitoring software does not include a mail transport so I setup postfix/sendmail.  Postfix will deliver (relay) mail, but only to our domain.  I have the need to be able to send to other email addresses outside our domain.  Our email service is hosted by a 3rd party and requires smtp authentication.  I believe that i have the smtp auth setup correctly otherwise I wouldn't be able to send any emails from the linux box (i use the sendmail command to test).  When I try to send email to another domain, gmail for example, I get the bounced back message below:

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This is the mail system at host linuxbox.localdomain.local.
 
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 mail system
 
<joe@gmail.com>: host mail.plazaproperties.com[64.26.60.153] said: 550
    <jjoe@gmail.com>: Recipient address rejected: Invalid recipient (in
    reply to RCPT TO command)
 
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