Re: [courier-users] DNS lookup problem
Bowie Bailey writes: On 5/11/2016 7:45 PM, Sam Varshavchik wrote: > Bowie Bailey writes: > >> $ testmxlookup westportyachtsales.com >> Domain westportyachtsales.com: >> Relay: mail.westportshipyard.com, Priority: 10, Address: >> :::208.91.197.132 > > There's something wrong with the westportshipyard.com domain. ... > Looks to me like this domain's bill was due last month, and it was not > paid, and the registrar took ownership of it. Looks like you are right. The westportshipyard.com website returns a Network Solutions parking page. However, that doesn't explain why testmxlookup and manual dns queries return different results. I ran a tcpdump on the mail server this morning and found that testmxlookup is requesting an record for some reason. When it doesn't get a result, it gives a soft error rather than looking for the A record (which does exist). [udp sum ok] 9540+ ? mail.westportshipyard.com. (43) [udp sum ok] 9540 ServFail q: ? mail.westportshipyard.com. 0/0/0 (43) Indeed. The parking NSes are broken, and throw up a SERVFAIL in response to a DNS query. How do I prevent Courier from trying to use ipv6? Only by recompiling Courier without any IPv6 support. IPv6 has been here for a while. It's not a new kid on the block. If a DNS server barfs in response to an query, it's the DNS server's problem. pgps6WZ1SJTNj.pgp Description: PGP signature -- Mobile security can be enabling, not merely restricting. Employees who bring their own devices (BYOD) to work are irked by the imposition of MDM restrictions. Mobile Device Manager Plus allows you to control only the apps on BYO-devices by containerizing them, leaving personal data untouched! https://ad.doubleclick.net/ddm/clk/304595813;131938128;j___ courier-users mailing list courier-users@lists.sourceforge.net Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
Re: [courier-users] DNS lookup problem
On 5/11/2016 7:45 PM, Sam Varshavchik wrote: > Bowie Bailey writes: > >> $ testmxlookup westportyachtsales.com >> Domain westportyachtsales.com: >> Relay: mail.westportshipyard.com, Priority: 10, Address: >> :::208.91.197.132 > > There's something wrong with the westportshipyard.com domain. ... > Looks to me like this domain's bill was due last month, and it was not > paid, and the registrar took ownership of it. Looks like you are right. The westportshipyard.com website returns a Network Solutions parking page. However, that doesn't explain why testmxlookup and manual dns queries return different results. I ran a tcpdump on the mail server this morning and found that testmxlookup is requesting an record for some reason. When it doesn't get a result, it gives a soft error rather than looking for the A record (which does exist). [udp sum ok] 9540+ ? mail.westportshipyard.com. (43) [udp sum ok] 9540 ServFail q: ? mail.westportshipyard.com. 0/0/0 (43) How do I prevent Courier from trying to use ipv6? -- Bowie -- Mobile security can be enabling, not merely restricting. Employees who bring their own devices (BYOD) to work are irked by the imposition of MDM restrictions. Mobile Device Manager Plus allows you to control only the apps on BYO-devices by containerizing them, leaving personal data untouched! https://ad.doubleclick.net/ddm/clk/304595813;131938128;j ___ courier-users mailing list courier-users@lists.sourceforge.net Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
Re: [courier-users] DNS lookup problem
Bowie Bailey writes: $ testmxlookup westportyachtsales.com Domain westportyachtsales.com: Relay: mail.westportshipyard.com, Priority: 10, Address: :::208.91.197.132 There's something wrong with the westportshipyard.com domain. Its registrar is network solutions. $ whois westportshipyard.com. [Querying whois.internic.net] [Redirected to whois.networksolutions.com] [Querying whois.networksolutions.com] [whois.networksolutions.com] No match for "WESTPORTSHIPYARD.COM.". And poking whois.internic.net without redirection: Domain Name: WESTPORTSHIPYARD.COM Registrar: NETWORK SOLUTIONS, LLC. Sponsoring Registrar IANA ID: 2 Whois Server: whois.networksolutions.com Referral URL: http://networksolutions.com Name Server: NS1.PENDINGRENEWALDELETION.COM Name Server: NS2.PENDINGRENEWALDELETION.COM Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited Updated Date: 24-apr-2016 Creation Date: 21-apr-1996 Expiration Date: 22-apr-2017 This domain's name servers look suspicious. Looks to me like this domain's bill was due last month, and it was not paid, and the registrar took ownership of it. pgpX2iAwVQ3fh.pgp Description: PGP signature -- Mobile security can be enabling, not merely restricting. Employees who bring their own devices (BYOD) to work are irked by the imposition of MDM restrictions. Mobile Device Manager Plus allows you to control only the apps on BYO-devices by containerizing them, leaving personal data untouched! https://ad.doubleclick.net/ddm/clk/304595813;131938128;j___ courier-users mailing list courier-users@lists.sourceforge.net Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
Re: [courier-users] DNS lookup problem
On 5/11/2016 4:11 PM, Gordon Messmer wrote: > On 05/11/2016 12:31 PM, Bowie Bailey wrote: >> $ testmxlookup westportyachtsales.com >> westportyachtsales.com: soft error. > > Have you checked for errors in your DNS server's logs? No errors that I can see. I guess I could use tcpdump to see what is actually happening. -- Bowie -- Mobile security can be enabling, not merely restricting. Employees who bring their own devices (BYOD) to work are irked by the imposition of MDM restrictions. Mobile Device Manager Plus allows you to control only the apps on BYO-devices by containerizing them, leaving personal data untouched! https://ad.doubleclick.net/ddm/clk/304595813;131938128;j ___ courier-users mailing list courier-users@lists.sourceforge.net Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
Re: [courier-users] DNS lookup problem
On 05/11/2016 12:31 PM, Bowie Bailey wrote: > $ testmxlookup westportyachtsales.com > westportyachtsales.com: soft error. Have you checked for errors in your DNS server's logs? -- Mobile security can be enabling, not merely restricting. Employees who bring their own devices (BYOD) to work are irked by the imposition of MDM restrictions. Mobile Device Manager Plus allows you to control only the apps on BYO-devices by containerizing them, leaving personal data untouched! https://ad.doubleclick.net/ddm/clk/304595813;131938128;j ___ courier-users mailing list courier-users@lists.sourceforge.net Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
[courier-users] DNS lookup problem
I have an outgoing email sitting in my mail queue due to a DNS failure, but I can't figure out why it is failing. When I test it manually, this is what I see: $ testmxlookup westportyachtsales.com westportyachtsales.com: soft error. $ dig @172.16.17.201 westportyachtsales.com mx +short 10 mail.westportshipyard.com. $ dig @172.16.17.201 mail.westportshipyard.com +short 208.91.197.132 $ testmxlookup westportyachtsales.com Domain westportyachtsales.com: Relay: mail.westportshipyard.com, Priority: 10, Address: :::208.91.197.132 172.16.17.201 is the first DNS server listed in resolv.conf, which is what Courier and testmxlookup should be using if I understand correctly. It also works if I query the second DNS sever manually. Now that I've gotten a response, testmxlookup will work for a while, but eventually it will start giving the soft error again for that domain. I am guessing that this is due to my DNS server caching the result, but why would my manual queries succeed and testmxlookup fail the first time? The queries are both coming from the same user on the same machine. -- Bowie -- Mobile security can be enabling, not merely restricting. Employees who bring their own devices (BYOD) to work are irked by the imposition of MDM restrictions. Mobile Device Manager Plus allows you to control only the apps on BYO-devices by containerizing them, leaving personal data untouched! https://ad.doubleclick.net/ddm/clk/304595813;131938128;j ___ courier-users mailing list courier-users@lists.sourceforge.net Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
