you can create a virtualhost in Apache (not in ISPConfig) with this content:
<VirtualHost 192.168.1.1:80>
ServerName mail.*:80
ServerAdmin
webmaster@domain.com
DocumentRoot /var/www/sharedip
RewriteEngine On
RewriteCond %{HTTP_HOST} ^webmail..+..+$ [NC]
RewriteCond %{HTTP_HOST} !^mail.domain.com$
RewriteRule ^(.*)$ https://webmail.domain.com$1 [R=301]
</VirtualHost>
It will redicrect all incoming querys from
http://mail.* to
https://webmail.domain.com (of course, "webmail" hosname in domain.com domain should exist, and "mail" host in all domains too, you can create them in DNS Manager)
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