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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
    They are basically rejecting the email from us. When I checked the SMTP logs it just says the email was bounced. Funnily enough this is one of two domains I have ever received this error from
  • 0 in reply to turboizzy
    OP, check your own mail setup out using mxtoolbox.com .... make sure you don't have any RDNS issues, etc.

    It's a great tool.  If your mail config passes the blacklist and SMTP tests on mxtoolbox.com, then the remote domains are the ones with the issue.

    CTO, Convergent Information Security Solutions, LLC

    https://www.convergesecurity.com

    Sophos Platinum Partner

    --------------------------------------

    Advice given as posted on this forum does not construe a support relationship or other relationship with Convergent Information Security Solutions, LLC or its subsidiaries.  Use the advice given at your own risk.

Reply
  • 0 in reply to turboizzy
    OP, check your own mail setup out using mxtoolbox.com .... make sure you don't have any RDNS issues, etc.

    It's a great tool.  If your mail config passes the blacklist and SMTP tests on mxtoolbox.com, then the remote domains are the ones with the issue.

    CTO, Convergent Information Security Solutions, LLC

    https://www.convergesecurity.com

    Sophos Platinum Partner

    --------------------------------------

    Advice given as posted on this forum does not construe a support relationship or other relationship with Convergent Information Security Solutions, LLC or its subsidiaries.  Use the advice given at your own risk.

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