sudo cat /etc/hosts
127.0.0.1 localhost
127.0.1.1 mytestdomain.com
# The following lines are desirable for IPv6 capable hosts
::1 localhost ip6-localhost ip6-loopback
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
it seems there is at least one error..
change this to 127.0.0.1 mytestdomain.com, change port to 25 in config and temporary disable ufw. You should have telnet mytestdomain.com 25 to be connected after that and then try to run elixir again
So I’ve changed /etc/hosts to correct IP 127.0.0.1
Added a rule for the ufw to allow 25 port: sudo ufw allow 25/tcp
and in my application config I’ve set the port: 25
And the email was sent, I’ve got it in my mailbox (though in spam).
First of all big thank you, guys for your help!
I still have a couple of questions:
In the postfix’s log there is quietness, no mention of the sent email, why is that?
And the second question is it dangerous to open 25 port? According to lines in my postfix config:
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
Is it safe config?
You are always welcome!
regarding port 25 - looks good, but I recommend to ask this question on postfix forum ))
UPD You can leave this port without any restrictions if you disable any connection from outside to port 25 in ufw. Allow just tcp from-to 127.0.0.0/24
UPD 2 Of course, you also should allow outgoing connections to any address to port 25 if you want to send a real emails
Well, the first question is not relevant, it’s just the ssh session was expired so the log was not updated.
Thanks, Alexey!
I’ve done:
sudo ufw delete allow 25/tcp
sudo ufw allow from 127.0.0.1 to any port 25
Tried to send email and everything worked.
@hauleth, as I said, I lack of experience in this, I’ve read that Postfix is the most popular smtp server for linux, is there a better software for linux you are pointing to?
I know about third party services but they are not free and what are the benefits of using them? Which one is better and why?
The most important reason is, that the IP of your host from which you send your emails is not “trusted”, and it will take a lot of time to build up necessary reputation to not get flagged as SPAM everywhere. This is especially true if you send a lot of mails at once, eg. Newsletters.
Ok, this is the good reason. So, why the services like mailgun and others are more trusted? They can’t be used to send spam? What are the means to make my domain trusted? I’ve already configured dns stuff like PTR, dkim.
In my case I only need my application to send registration activation letters and send notifications about fresh content on the site related to the user, like this forum does.
And yes, my test emails get into spam folder in gmail, some other mail providers don’t filter my emails. But I had a hope that when I will add a company contacts like address in the bottom of my real letters it would help with this problem and they won’t get into spam.