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[8.001] SMTP Proxy blocks legitimate mail, cause "RDNS missing"

Copyright
Hi

our SMTP proxy (ASG 8.001) is blocking legitimate mail (for example from astaro.com) because of "RDNS missing":

---

H=(mx.astaro.com) [213.144.15.13]:51016 F= rejected RCPT : No RDNS entry for 213.144.15.13

---

>nslookup 213.144.15.13
Name:    mx.astaro.com
Address:  213.144.15.13

---

H=(ns3.ticketcorner.com) [195.47.231.137]:60788 F= rejected RCPT : No RDNS entry for 195.47.231.137

---

C:\Dokumente und Einstellungen\dtschan>nslookup 195.47.231.137
Name:    ns3.ticketcorner.com
Address:  195.47.231.137
---

I had to deactivate RDNS check completely to get these mails again. Our second SMTP proxy (ASG 7.506) doesn't show this false positives.

Anyone else seen this issue ?


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Parents
  • 0
    I suggest trying the reverse look-ups from the Astaro itself rather than from your workstation.  Support -> Tools -> DNS Lookup will let you see what the Astaro is seeing.
  • 0 in reply to JonEtkins
    I suggest trying the reverse look-ups from the Astaro itself rather than from your workstation.  Support -> Tools -> DNS Lookup will let you see what the Astaro is seeing.


    Hi Jetkins

    the same result if i resolve the ip's directly on the Astaro. The Astaro resolves the ip's correctly, but the mails are blocked because of "RDNS missing".

    strange...

    ---
    Trying "13.15.144.213.in-addr.arpa"

    ;; ->>HEADER>HEADER
Reply
  • 0 in reply to JonEtkins
    I suggest trying the reverse look-ups from the Astaro itself rather than from your workstation.  Support -> Tools -> DNS Lookup will let you see what the Astaro is seeing.


    Hi Jetkins

    the same result if i resolve the ip's directly on the Astaro. The Astaro resolves the ip's correctly, but the mails are blocked because of "RDNS missing".

    strange...

    ---
    Trying "13.15.144.213.in-addr.arpa"

    ;; ->>HEADER>HEADER
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