Roundcube not sending mail

So I’m able to send mail from other email services like gmail using the custom email. However when i try to send mail from roundcube i get this error: SMTP Error (): Connection to server failed.

I can receive and see emails, just cant send on the roundcube

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Is Exim listening on port 587?

Im not sure, how would i check?

lsof -Pn +c0 -i:25,465,587 -sTCP:LISTEN

exim4 53315 Debian-exim 4u IPv4 125894 0t0 TCP *:25 (LISTEN)
exim4 53315 Debian-exim 5u IPv4 125895 0t0 TCP *:465 (LISTEN)
exim4 53315 Debian-exim 6u IPv4 125896 0t0 TCP *:587 (LISTEN)

They are up

Rouncube is in the same machine than your Exim?

Correct, everything is on the same machine; On Linode.

Check if you can see the 250 HELP message:

openssl s_client -starttls smtp -connect localhost:587

Getting an error:

4037D7EE2B7F0000:error:8000006F:system library:BIO_connect:Connection refused:../crypto/bio/bio_sock2.c:125:calling connect()
4037D7EE2B7F0000:error:10000067:BIO routines:BIO_connect:connect error:../crypto/bio/bio_sock2.c:127:

Seems or a firewall issue or you have not configured correctly the certificate:

iptables -S
ls -l /usr/local/hestia/ssl/certificate.crt

Im not sure what im looking for the iptables, for the second command im getting: -rw-rw---- 1 Debian-exim mail 3945 Nov 9 19:00 /usr/local/hestia/ssl/certificate.crt

I would prefer to see the entire output but you should see something like this:

-A INPUT -p tcp -m multiport --dports 25,465,587 -j ACCEPT

and also whether your ip is neither dropped or rejected

Also, show if you can connect directly to port 587:

telnet localhost 587

If you don’t have telnet installed: apt install telnet

Also, the status of of exim service:

systemctl status exim4

Here is the full output root@panel:~# iptables -S-P INPUT DROP-P FORWARD ACCEPT-P OUTPUT ACCEPT- -

root@panel:~# telnet localhost 587

Trying ::1...
telnet: Unable to connect to remote host: Connection refused
root@panel:~# systemctl status exim4

● exim4.service - LSB: exim Mail Transport Agent
     Loaded: loaded (/etc/init.d/exim4; generated)
     Active: active (running) since Thu 2023-11-09 20:28:10 UTC; 36min ago
       Docs: man:systemd-sysv-generator(8)
    Process: 53066 ExecStart=/etc/init.d/exim4 start (code=exited, status=0/SUCCESS)
      Tasks: 1 (limit: 2220)
     Memory: 14.6M
        CPU: 384ms
     CGroup: /system.slice/exim4.service
             └─53315 /usr/sbin/exim4 -bd -q30m

Nov 09 20:28:10 systemd[1]: Starting LSB: exim Mail Transport Agent...
Nov 09 20:28:10 exim4[53066]:  * Starting MTA
Nov 09 20:28:10 exim4[53066]:    ...done.
Nov 09 20:28:10 systemd[1]: Started LSB: exim Mail Transport Agent.

Ok, try with ipv4:

telnet 587

root@panel:~# telnet 587


Connected to
Escape character is '^]'.
1 Like

Ok, edit your file /etc/hosts and comment the line that looks like:

::1 localhost ip6-localhost ip6-loopback

So you will get this:

#::1 localhost ip6-localhost ip6-loopback

and double check that you have a line like this: localhost

Save the file and try to connect again to port 587 using localhost:

telnet localhost 587

If you can connect, try again Roundcube.

1 Like

Yep that worked, thank you so much!


Okay, I’m noticing after doing that, apt updates and things like that are failing to resolve.

Temporary failure resolving ''