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"550 Access denied - Invalid HELO name" when emails are sent to certain domains

turboizzy
Hi,

I've noticed recently that when emails are being sent to certain domains from our Exchange Server they are failing a HELO check. Our emails our going through the Astaro SMTP proxy, all emails going out from the proxy are doing so via one IP address and I have checked that this IP address is not blacklisted anywhere. Also the the IP address associated with sending out email has a public DNS record.

Any help appreciated.

Thanks


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  • 0
    Here's the line from the Astaro log:

    2012-11-11 11:46:00 sales@hostgods.net P= R=dnslookup T=remote_smtp: SMTP error from remote mail server after MAIL FROM: SIZE=9180: host hostgods.net [5.9.131.20]: 550 Access denied - Invalid HELO name (See RFC2821 4.1.1.1)
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  • 0
    Here's the line from the Astaro log:

    2012-11-11 11:46:00 sales@hostgods.net P= R=dnslookup T=remote_smtp: SMTP error from remote mail server after MAIL FROM: SIZE=9180: host hostgods.net [5.9.131.20]: 550 Access denied - Invalid HELO name (See RFC2821 4.1.1.1)
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