Webmail Access

[TGates]

this is working for me

# Configuration for WebMail
<VirtualHost *:443>
ServerAlias mail.*
DocumentRoot "/etc/sentora/panel/etc/apps/webmail/"
AddType application/x-httpd-php .php
<Directory "/etc/sentora/panel/etc/apps/webmail/">
Options +FollowSymLinks -Indexes
AllowOverride All
Require all granted
</Directory>

# Custom settings are loaded below this line (if any exist)
SSLEngine on
SSLProtocol ALL -SSLv2 -SSLv3
SSLHonorCipherOrder On
SSLCipherSuite ECDH+AESGCMH+AESGCM:ECDH+AES256H+AES256:ECDH+AES128H+AES:ECDH+3DESH+3DES:RSA+AESGCM:RSA+AES:RSA+3DES:!aNULL:!MD5:!DSS
SSLCertificateFile /etc/letsencrypt/live/mail.domain.com/cert.pem
SSLCertificateKeyFile /etc/letsencrypt/live/mail.domain.com/privkey.pem
SSLCertificateChainFile /etc/letsencrypt/live/mail.domain.com/chain.pem
# Keeping bellow for future upgrades.
# Requires Apache >= 2.4
SSLCompression off
</VirtualHost>

You should not be using mail.domain.com as an actual sub domain. This is reserved for the mail server specifically. You should be using something like webmail.domain.com or email.domain.com for example.