And Jon, next time please use some public tools to verify DNS failures are not just specific to you or your provider (ISP, VPN, or otherwise). Do this _before_ reporting such outages to outages@. Here are some such tools you can use (these do resolution server-side): https://mxtoolbox.com/DNSLookup.aspx https://dnschecker.org/all-dns-records-of-domain.php https://www.nslookup.io/ https://dns-lookup.net/ Finally: dig +trace is often disabled by some providers/resolvers; sometimes you have to do things the manual / old-fashioned way. Thanks. -- | Jeremy Chadwick jdc@koitsu.org | | UNIX Systems Administrator PGP 0x2A389531 | | Making life hard for others since 1977. | On Mon, Sep 08, 2025 at 06:53:06PM -0400, Jon R Kibler via Outages-discussion wrote:

All, Thanks for the replies. I'm kinda at a loss as to where the problem is. I'm using Mullvad's filtered DNS, and even with all filters off, USPS.COM fails to resolve. I have no issues with any other domain. However, the error has now changed from SERVFAIL to TIMEOUT. The only thing I can conclude is that USPS.COM (or, edgekey.net, or akamiaedge.net, ...) is blocking all Mullvad DNS servers for some reason. What is interesting however, is, from the `host tools.usps.com` below, I lookup tools.usps.com and it times out. If I lookup wildcard.usps.com.edgekey.net I get name resolution. $ host tools.usps.com;; connection timed out; no servers could be reached$ host wildcard.usps.com.edgekey.netwildcard.usps.com.edgekey.net is an alias for e6531.dsca.akamaiedge.net.e6531.dsca.akamaiedge.net has address 23.60.1.81e6531.dsca.akamaiedge.net has IPv6 address 2600:1403:c400:138d::1983e6531.dsca.akamaiedge.net has IPv6 address 2600:1403:c400:1383::1983 So, it must be something usps.com specific—unless someone else has another idea. Also, when I do a `dig +trace` it hangs forever, then eventually times out after listing the root-servers. If I learn anything interesting from Mullvad I will follow up with a discussions post. Thanks for all the feedback. Jon K

On 9/8/2025 at 5:53 PM, "Andy Ringsmuth via Outages-discussion" wrote:Seems OK for me from Lincoln, Nebraska, as of 2:53 p.m. CDT:

$ host tools.usps.com tools.usps.com is an alias for wildcard.usps.com.edgekey.net. wildcard.usps.com.edgekey.net is an alias for e6531.dsca.akamaiedge.net. e6531.dsca.akamaiedge.net has address 23.217.76.111 e6531.dsca.akamaiedge.net is an alias for e6531.dsca.akamaiedge.net.0.1.cn.akamaiedge.net. e6531.dsca.akamaiedge.net.0.1.cn.akamaiedge.net has IPv6 address 2600:1406:3a00:783::1983 e6531.dsca.akamaiedge.net.0.1.cn.akamaiedge.net has IPv6 address 2600:1406:3a00:791::1983 e6531.dsca.akamaiedge.net is an alias for e6531.dsca.akamaiedge.net.0.1.cn.akamaiedge.net. $ host usps.com usps.com has address 56.0.134.100 usps.com mail is handled by 10 mxb-0038fd02.gslb.gpphosted.com. usps.com mail is handled by 10 mxa-0038fd02.gslb.gpphosted.com. ---- Andy Ringsmuth andy@andyring.com

...

On Sep 8, 2025, at 2:18 PM, Jon R Kibler via Outages wrote:

Apparently the USPS is having DNS issues... $ host tools.usps.com

Host tools.usps.com not found: 2(SERVFAIL) $ host usps.com Host usps.com not found: 2(SERVFAIL) Not having issues with any other domain... Jon K

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