1. Yes, it possible, ISPmanager can support SMTP servers Sendmail, Postfix and Exim and POP3/IMAP server Dovecot.
2. You can install from ISPmanager installer Squirrelmail web-based email client
If you need use Roundcube - you need install it manually, it possible, you need confugure Roundcube for IMAP connection to localhost for get email and SMTP for send.
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