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Christian_AgardFlag for Trinidad and Tobago

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REJECTED - MULTI-BLACKLIST -[S=3 - rep.mailspike.net] - NoHeloHost>

My mail server is being blocked when sending mail to a couple hosts. This is the message from bounced mails

There was a SMTP communication problem with the recipient's email
server.  Please contact your system administrator.
    <mailservername #5.5.0 smtp;550-REJECTED - MULTI-BLACKLIST -
[S=3 -  rep.mailspike.net] -  NoHeloHost>

What is the cause of this particular error?
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Lazarus
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