Yes, you can send device enrollment email be sent via third-party email servers.
For sending the same you need to have the below details
a. Email address that will be used to send the email.
b. Smtp settings of the domain.
c. SMTP Port number to be used.
d. Auth Username
e. Auth Password
Eg: For gmail
e. Password for the account firstname.lastname@example.org
Note: eScan console currently support port numbers 25, 465, 587