David W SonicWall Employee
Comments
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@SonicAdmin80 Do you have one of the NDR's? You stated that if you send them direct to email security they come through but only when going to O365 first does this occur. That makes this sound like O365 is generating the NDR as an unsupported option on their end.
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@SonicAdmin80 It sounds like what I found here.
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@BWC no, at least it wasn't done on purpose. I've informed the back end again about it.
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It looks like the recipient side for many of these that were an issue finally updated their DNS about an hour ago. I can see messages to gmx.de not being delivered since that time.
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@ThK The responses seen when you open up a message it what the recipient server responded with. I would post any relevant information to the case you have open so the tech can help look into it. At this time most of this appears to be DNS on recipient side however each one needs to be looked at independently.
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@BWC All of that is the IT Op's side of the house. Not sure exactly how it's all set but it's all load balanced. I've asked them if they can force a full public refresh.
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@BWC The SPF one it looks like the recipient side cannot see the SPF record. I've cheeked and its there and all good.
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statstik.rlp.de, movere.sha.de and pfaender-freiburg.de have no MX records. this one: smtp;550 Requested action not taken: mailbox unavailable invalid DNS MX or A/AAAA resource record. I identified as no PTR resolving on recipient side but it does exist and the other one appears to be an SPF issue. smtp;550 DMARC Sender…
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Looking at this the errors are the "Requested action not taken: mailbox unavailable invalid DNS MX or A/AAAA resource record." However when checking all the proper records are there for everything. The only thing I can think of is that their servers are not updating on their DNS and not seeing all of the Records such as…
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@BWC and @franz I'm still looking things over. I also personally use IONOS as well and seeing if I can query one of their DNS server but having a hard time finding one. @BWC Is this the only ones you are having issues sending to?
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I've been doing some investigation and this appears to be for the most part various DNS servers having issues. Example: I can query 8.8.8.8 and 1.1.1.1 and get proper PTR results every time. If I query 4.2.2.2 it comes up with different results every time I query and is missing many records. This right now this appears to…
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I've been watching and the DNS change just updated a couple minutes ago. Give it a little bit then test it again please. Thanks
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Please check now guys, IT Op's made some corrections to the DNS and I believe it should all be working but may take a little time for some servers to propagate DNS.
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An OOO will not contain a valid sender. An OOO will use <NULL> instead. Since SPF is based on sender domain and the sending IP those will fail
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It would be best to set the same message size limit on Email Security. You can set it in the connection management page. Keep in mind this os an organizational; limit. I would set this as the largest allowed message size first. After that you can set limits using filters for specific users or groups of users.