Find answers to sendmail gets host name lookup failure from the expert community at experts exchange. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. In testing, it worked the first two or three times, but all following attempts did not reach the yahoo account. His domain resolves just fine, but whenver i would try to send email, id get a host name lookup failure, and the mail. The brackets tell sendmail to ignore doing mx lookups. But now i get a mail delivery undeliverable message back three hours after i sent the original email that says permanent fatal errors and then. Then used ifconfig eth1 dhcp start it does not work and say. Newer sendmail versions provide additional information about possible problems. In the next step, click on the internet protocol version 4 tcpipv4.
Setting the hostname in sendmail major hayden words of. Aug 23, 2017 the code that included in the sendmail. Stores information about the type of mailer programs running. When i run mailq, it shows lot of connections as host map. I basically only want to do this to aggregate my logcheck, etc mails in one mailbox, that is also accessible from the outside. I am starting to see a certain type of email that is causing problems for our users. Server fault is a question and answer site for system and network administrators. I can do nslookup for mailhost and i am getting the correct resolution i can also ping mailhost. Im going out on a bit of a limb here, but i think the problem is your remote host. Mar 20, 2015 i have a droplet running a mail server with dovecot, postfix and mysql. A hostname lookup failure means that the server to which your email is being sent cant be found.
I have set up a mail server using sendmail and debian 3. I keep getting the following error, and nothing i do seems to be able to fix it. What does host name lookup failure mean in an email bounce. Everyday more than 80000 mails are sent out from this server. I dont know why, but if a name doesnt get resolved, then my domain gets appended to the name, then the dns lookup resolves to my ip address because of the wildcard. Why is sendmail appending my hostname to unknown destination. I know that on windows, if i swap cables between routers, the tcpip configuration gets updated and i can carry on as. In the following screenshot, we can see the content of the sendmail. Then if you wish local mail to remain local then you can uncomment the following ruleset to accomplish that.
Hello everyone, after hours of googling and searching, ive managed to trace a php mail problem to the fact that sendmail isnt working. Run tcpdump on the sods server to see if requests are being receivedsent back. Jun 23, 2001 yes, your ip address should be listed in your etchosts file so ifconfig doesnt need to be given it explicitly, and when running ifconfig you should pass the name of the interface probably eth0. I can do nslookup for mailhost and i am getting the correct resolution i can also. When this certain type of spam comes in with random. Host name lookup failures occur intermittently which causes some messages to remain in queue. I had a remarkably similar problem to one in the referenced thread sendmail emails wont go out, host name lookup failure entries in the log. However, the forward a lookup will fail or give at least a different ip address, hence the name is marked as may be forged note. This ruleset is called whenever a client connects via esmtp to the server. Find answers to sendmail configuration host name lookup failure from the expert community at experts exchange. On a bigger card, you can make more space available to your root partition by running on the console of your booted rpi. We have a windows nt network, on which we have a redhat 6. Sending mail via sendmail gives error in maillog name server.
The problem is probably that you are trying to send mail from an ip that is not allowed to deliver email to the destination server. As it iterates through the additional recipients, sendmail on freebsd does a name lookup on each one trying aaaa, a, and mx records additionally with search domain permutations to each of the sendmail hosts name servers and when it fails because the sender mistyped the additional recipients addresses it returns the error. Stack overflow for teams is a private, secure spot for you and your coworkers to find and share information. If you need to change the hostname that sendmail announces itself as, just add the following to sendmail. You can also just change your smart host to the hostname lookup failure results from sendmail trying to perform an mx record lookup on the actual smart host, something thats not likely to be there in some cases. Solved host name lookup failure the freebsd forums. Instructions on how to write the downloaded image to your card can be found here. Many dialupxdsl lines without a true mx record are not allowed to deliver mail to many servers.
My outgoing messages dont get sent and i get this in the mail log for a message to a hypothetcial. Sendmail, it seems, cannot find the local host name. Our internal office ip addresses are all in the range of 198. I checked mailq, and this message reoccured in all sendmail attempts. The file shows that there was a host name lookup failure. We need to add our remote office to our linux routing table. Like you i can resolve the smarthost name and ping it.
I can ping internally by hostname to all local machines mostly windows and i can also ping yahoo. Sep 08, 2004 i have set up a mail server using sendmail and debian 3. When i run my web application which sends mail on my dev machine, the mail is not sent. I wrote a page for my website that sends an email to a yahoo address when the form is submitted. Problems host name lookup failure sendmail unix and linux forums. It will show you two boxes to enter dns servers you want to use. Information contained in this file includes such items as the host name and domain, and the sendmail rule sets. Google has been less than helpful, as has ubuntus official and nonofficial support forums, and sendmail. Jan 16, 2018 host name lookup failure on change of isp.
Host name lookup failure how can i setup a fqdn on this vmware instance, knowing that the final image will be used by many students on their own laptops during classes. If your company has an existing red hat account, your organization administrator can grant you access. Host name lookup failure we need to add our remote office to our linux routing table. Temporary failure in name resolution or host name lookup. Aug 27, 2011 i sent an email to someone who i normally email.
If it does not help try ipv4 address inside square. Im guessing its something to do with the reverse lookup of the address of the smarthost failing did you ever manage to overcome your problem. If you are a new customer, register now for access to product evaluations and purchasing capabilities. I am running sendmail on fedora with mimedefangfilter. Host name lookup failure on change of isp the freebsd forums.
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