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Hello my mail server is very slow to accept SMTP connections.

I found a tutorial to make a stop in my Exim4 and run the command below to see where it takes.

exim -bd -d -oX 587

Follow the exit, and where is more downtime. Can you help me figure out why it is so slow.

29136 Connection request from 187.23.45.188 port 61995
29136 search_tidyup called
29136 1 SMTP accept process running
29136 Listening...
29141 sender_fullhost = [187.23.45.188]
29141 sender_rcvhost = [187.23.45.188]
29141 Process 29141 is handling incoming connection from [187.23.45.188]
29141 host in host_lookup? yes (matched "*")
29141 looking up host name for 187.23.45.188 -----> VERY SLOW HERE
Hiago Souza
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  • This is EXIM doing a reverse lookup. What DNS servers do you have setup ? – Junaid Oct 12 '16 at 01:00
  • so I do not know, I just did the installation of "VestaCP" and is the default setting. – Hiago Souza Oct 12 '16 at 01:03
  • run this command cat /etc/resolv.conf and paste the output – Junaid Oct 12 '16 at 01:07
  • # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8) # DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN nameserver 172.31.0.2 search sa-east-1.compute.internal – Hiago Souza Oct 12 '16 at 01:07
  • Questions about systems with administrative control panels are [generally off-topic](http://meta.serverfault.com/questions/3922/question-about-migrated-post-that-was-closed/3924#3924) here at Server Fault. – Paul Oct 12 '16 at 01:26
  • Sorry my friend, do not know where you heard me say something about system administration panel. – Hiago Souza Oct 12 '16 at 11:36

1 Answers1

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I'am solved this problem.

I edited a file /etc/exim4/exim4.conf.template and modified this lines:

#host_lookup = *
rfc1413_hosts = *
rfc1413_query_timeout = 0s
Hiago Souza
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