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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
    If Bruce says it, you can take it to the bank! [;)]

    Turboizzy, if you want to post the relevant lines here from the SMTP log, I bet we can see if the other side actually bounces the email or if the Astaro rules it "bounced" because the other side is broken.

    Cheers - Bob
     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
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  • 0
    If Bruce says it, you can take it to the bank! [;)]

    Turboizzy, if you want to post the relevant lines here from the SMTP log, I bet we can see if the other side actually bounces the email or if the Astaro rules it "bounced" because the other side is broken.

    Cheers - Bob
     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
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