Sendmail is slow to send mail

I noticed that our Rails app gets error when attempting to create a user and it narrowed down to sending a registration email.

When I tried to manually test it it turned out that mail actually goes out but with huge delay. It takes 1 minute to process.

time echo test | sendmail

real 1m0.170s user 0m0.008s sys 0m0.004s

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Hi Jurgen, <br> <br>If you check your /var/log/mail.log you will probably find something like this: My unqualified host name (localhost) unknown; sleeping for retry. This is because sendmail requires “hostname” to be a fully qualified domain name. <br> <br>update your “/etc/hosts” file: nano /etc/hosts <br>to look like this: localhost.localdomain localhost yourhostname <br> <br>boom, fast sendmail.

You are my hero !!! changing the hosts did the magic !!!

Have you restarted the process? <br>sudo service sendmail restart