Thread Info
  • State Not Answered
  • Locked Locked
  • Replies 26 replies
  • Subscribers 1 subscriber
  • Views 26827 views
  • Users 0 members are here
Options
Suggested
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

"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


This thread was automatically locked due to age.
Parents
  • 0
    220 Astaro ESMTP ready.
    Test Result Hide
    SMTP Reverse Dns OK - 81.137.39.162 resolves to host81-137-39-162.in-addr.btopenworld.com
    SMTP Reverse DNS Mismatch Warning - Reverse DNS does not match SMTP Banner Ignore
    SMTP TLS OK - Supports TLS.
    SMTP Connection Time 0 seconds - Good on Connection time
    SMTP Open Relay OK - Not an open relay.
    SMTP Transaction Time 0.718 seconds - Good on Transaction Time
    Session Transcript:
    EHLO please-read-policy.mxtoolbox.com
    250-Astaro Hello mxtb-pws3.mxtoolbox.com [64.20.227.133]
    250-SIZE 52428800
    250-PIPELINING
    250-AUTH PLAIN LOGIN
    250-STARTTLS
    250 HELP [140 ms]
    MAIL FROM: 
    250 OK [156 ms]
    RCPT TO: 
    550 Relay not permitted [140 ms]
Reply
  • 0
    220 Astaro ESMTP ready.
    Test Result Hide
    SMTP Reverse Dns OK - 81.137.39.162 resolves to host81-137-39-162.in-addr.btopenworld.com
    SMTP Reverse DNS Mismatch Warning - Reverse DNS does not match SMTP Banner Ignore
    SMTP TLS OK - Supports TLS.
    SMTP Connection Time 0 seconds - Good on Connection time
    SMTP Open Relay OK - Not an open relay.
    SMTP Transaction Time 0.718 seconds - Good on Transaction Time
    Session Transcript:
    EHLO please-read-policy.mxtoolbox.com
    250-Astaro Hello mxtb-pws3.mxtoolbox.com [64.20.227.133]
    250-SIZE 52428800
    250-PIPELINING
    250-AUTH PLAIN LOGIN
    250-STARTTLS
    250 HELP [140 ms]
    MAIL FROM: 
    250 OK [156 ms]
    RCPT TO: 
    550 Relay not permitted [140 ms]
Children
No Data
Unfiltered HTML