Can't send mails with exim on port 26

Hi, I can't send mail with Exim. It's listening on port 26. "telnet hostname 26" is responding, and for example testing it from here: - Removed - prints "Mail successfully sent". I'm using AUTH, no ssl/tsl, and user and password created with cpanel -> Mail accounts. I can see the requests coming in /var/log/exim_mainlog, but it seems like it can't deliver them. Every host goes to timeout or gives this (/var/log/exim_mainlog output with an example for gmail): 2019-01-24 06:07:36 SMTP connection from [ip address]:58802 (TCP/IP connection count = 1) 2019-01-24 06:07:36 1gmdnE-0005gb-KC <= someusr@yahoo.com H=6d.1e.089f.ip4.static.sl-reverse.com (prod1.example.com) [ip address]:58802 P=esmtpa A=dovecot_login:no-reply@mail.example.com S=1735 id=704366819.7.1548331657395@prod1 T="mail object" for mail@gmail.com 2019-01-24 06:07:36 SMTP connection from 6d.1e.089f.ip4.static.sl-reverse.com (prod1.example.com) [159.8.30.109]:58802 closed by QUIT 2019-01-24 06:07:36 cwd=/var/spool/exim 3 args: /usr/sbin/exim -Mc 1gmdnE-0005gb-KC 2019-01-24 06:07:36 1gmdnE-0005gb-KC Sender identification U=farmacpadmin D=mail.example.com S=no-reply@mail.example.com 2019-01-24 06:07:36 1gmdnE-0005gb-KC SMTP connection outbound 1548331656 1gmdnE-0005gb-KC hostname mail@gmail.com 2019-01-24 06:07:36 1gmdnE-0005gb-KC == mail@gmail.com R=dkim_lookuphost T=dkim_remote_smtp defer (-53): retry time not reached for any host for 'gmail.com'
More info: - "WHM Home " Security Center " SMTP Restrictions" is disabled; - "ping