Mail client problem

I could not configure app in phone and PC (tried myMail, Aqua Mail, and Thunderbird on PC). When I tried add account I’ve error (screenshot from aqua mail attached. In kei.pl I have registered my domain).

My site, Direct Admin and roundcube works well under SSL

My domain is: digitaldruk.pl
My web server is: apache 2.4.43
The operating system my web server runs on is: Centos 7.7
I can login to a root shell on my machine: yes
I’m using a control panel to manage my site: Direct Admin 1.6

Hi @Lapcio7

checking your mail subdomain - https://check-your-website.server-daten.de/?q=mail.digitaldruk.pl

The ip address:

Host T IP-Address is auth. ∑ Queries ∑ Timeout
mail.digitaldruk.pl A 94.152.2.64 Warsaw/Mazovia/Poland (PL) - KEI.PL Sp. z o.o. Hostname: parking.kei.pl yes 1 0
AAAA yes

A parking page? And the certificate is from kei.pl.

I don't think you are able to configure that server.

Host T IP-Address is auth. ∑ Queries ∑ Timeout
digitaldruk.pl A 77.91.61.189 Włocławek/Kujawsko-Pomorskie/Poland (PL) - Sat Film Sp. z o.o Hostname: user61-189.otwarta.pl yes 1 0
AAAA yes
www.digitaldruk.pl A 77.91.61.189 Włocławek/Kujawsko-Pomorskie/Poland (PL) - Sat Film Sp. z o.o Hostname: user61-189.otwarta.pl yes 1 0
AAAA yes

is used. But may be there doesn't run a mail server.

If the mail server runs on that ip - 94.152.2.64 -, you must use kei.pl as domain name to connect, if your provider doesn't support certificates with customer domains.

Thanks. I changed IP for mail.digitaldruk.pl to 77.91.61.189, and now it’s OK.

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