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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
    When you deleted the OpenDNS servers, did you hit [Apply] first?  If you did and you're still having this porblem, I think I'd consider reloading from ISO.  There may be an 8.001 ISO in the coming days.  It looks like you're a commercial customer with support on other Astaros, so I think the first thing to do would be to submit a ticket to Astaro Support if you have Premium support.

    Cheers - Bob
     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
Reply
  • 0
    When you deleted the OpenDNS servers, did you hit [Apply] first?  If you did and you're still having this porblem, I think I'd consider reloading from ISO.  There may be an 8.001 ISO in the coming days.  It looks like you're a commercial customer with support on other Astaros, so I think the first thing to do would be to submit a ticket to Astaro Support if you have Premium support.

    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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