Hello,
Recently, I noticed that one of the sent email is bounced back with SMTP error - "Unable to find the recipient's email server. The DNS query has failed. Tried 5 time(s)".
I checked the DNS query (https://intodns.com/) on their domain and validated email with email validator (https://verifalia.com/) and found no issue. Recipient is receiving emails from other people and sending emails to others. After few days, I tested sending email to another email account under same domain name and found no success (bounced back).
I am using MS Outlook 2016 as email client to send and receive emails and have no problem in sending email to others and receiving email from others.
What I am missing here? Using Version 5.6.8 - Build 2431 of hMailServer.
Unable to find the recipient's email server. The DNS query has failed.
- VadaDosaIdly
- Normal user
- Posts: 39
- Joined: 2020-05-26 16:03
Re: Unable to find the recipient's email server. The DNS query has failed.
in short, your DNS is not able to resolve it.
open an account at an SMTP service such as smtp2go and route your outbounds to this domain.
many have limited (reasonable) free packages.
open an account at an SMTP service such as smtp2go and route your outbounds to this domain.
many have limited (reasonable) free packages.
Katip
--
HMS 5.7, MariaDB 10.4.10, SA 4.0.0, ClamAV 0.103.8
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HMS 5.7, MariaDB 10.4.10, SA 4.0.0, ClamAV 0.103.8
-
- Senior user
- Posts: 837
- Joined: 2016-12-08 02:21
Re: Unable to find the recipient's email server. The DNS query has failed.
Make sure that the recipient domain's MX record Host attribute names an A record and not a CNAME for glue to the host's IP address. I seem to remember that hMailServer requires strict RFC compliance and does not resolve CNAME Host references in MX records, even though some authorities configure DNS that way.
Re: Unable to find the recipient's email server. The DNS query has failed.
You could also try a different DNS
Which DNS are you using?
(Google's free DNS is 8.8.8.8 and 8.8.4.4)
You can use the hMailserver to check an email address, it just uses the Windows default DNS, so you'd get the same result using NSLOOKUP at a command prompy
It's also possible that you have a rogue host file entry is this is a know domain for you
Which DNS are you using?
(Google's free DNS is 8.8.8.8 and 8.8.4.4)
You can use the hMailserver to check an email address, it just uses the Windows default DNS, so you'd get the same result using NSLOOKUP at a command prompy
It's also possible that you have a rogue host file entry is this is a know domain for you
Just 'cause I link to a page and say little else doesn't mean I am not being nice.
https://www.hmailserver.com/documentation
https://www.hmailserver.com/documentation
Re: Unable to find the recipient's email server. The DNS query has failed.
Could this be a Windows ARP or Windwos DNS Resolver Cache issue?
This sounds a bit like similar problems I have viewed on the Forum before. Perhaps Windows is going to the ARP Windows Resolver Cache table to find the Domain and the entry there is not resolving to the what is on the Public DNS. You guys are more knowledgeable on this than I am but it sounds similar to what I've seen in the Forum before.
A Windows Command Prompt ipconfig /flushdns might clear the Windows DNS Resolver Cache and resolve the problem. An ipconfig /registerdns might also have to be done if this is the problem.
This sounds a bit like similar problems I have viewed on the Forum before. Perhaps Windows is going to the ARP Windows Resolver Cache table to find the Domain and the entry there is not resolving to the what is on the Public DNS. You guys are more knowledgeable on this than I am but it sounds similar to what I've seen in the Forum before.
A Windows Command Prompt ipconfig /flushdns might clear the Windows DNS Resolver Cache and resolve the problem. An ipconfig /registerdns might also have to be done if this is the problem.
If you think you understand quantum mechanics, you don't understand quantum mechanics.
Re: Unable to find the recipient's email server. The DNS query has failed.
Been discussed before.
viewtopic.php?p=227670#p227670
INI option "use_dns_cache=0" was added to 2.6.8 B2538.30 (RvdH) to allow bypass of Windows DNS Cache
viewtopic.php?p=227670#p227670
INI option "use_dns_cache=0" was added to 2.6.8 B2538.30 (RvdH) to allow bypass of Windows DNS Cache
SørenR.
Woke is Marxism advancing through Maoist cultural revolution.
Woke is Marxism advancing through Maoist cultural revolution.
Re: Unable to find the recipient's email server. The DNS query has failed.
But he uses B2431 not B2538.30 And could it also be ARP if not Windows DNS Resolver Cache. I know I had to on one occasion for some problem I had to edit the ARP to remove an entry which was causing me problems.SorenR wrote: ↑2021-06-13 11:03Been discussed before.
viewtopic.php?p=227670#p227670
INI option "use_dns_cache=0" was added to 2.6.8 B2538.30 (RvdH) to allow bypass of Windows DNS Cache
If you think you understand quantum mechanics, you don't understand quantum mechanics.
Re: Unable to find the recipient's email server. The DNS query has failed.
Same effect here...jim.bus wrote: ↑2021-06-13 11:36But he uses B2431 not B2538.30 And could it also be ARP if not Windows DNS Resolver Cache. I know I had to on one occasion for some problem I had to edit the ARP to remove an entry which was causing me problems.SorenR wrote: ↑2021-06-13 11:03Been discussed before.
viewtopic.php?p=227670#p227670
INI option "use_dns_cache=0" was added to 2.6.8 B2538.30 (RvdH) to allow bypass of Windows DNS Cache
Code: Select all
Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\Dnscache,
Locate the Start registry key and change its value from 2 (Automatic) to 4 (Disabled)
Code: Select all
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Dnscache\Parameters]
"MaxCacheTtl"=dword:00000001
"MaxNegativeCacheTtl"=dword:00000000
SørenR.
Woke is Marxism advancing through Maoist cultural revolution.
Woke is Marxism advancing through Maoist cultural revolution.