hi ,
i want use wpmandrill word press plugin for email smtp but after configuration of this plugin. mails are not delivering to the student email address and showing message as
The e-mail could not be sent.
Possible reason: your host may have disabled the mail() function.
https://www.greatonlinetraining.com
Firstly mandrill is no longer free its acquired by mailchimp, therefore if you do not have mail chimp premium account then you cannot send emails using mandrill/mailchimp.
Secondly this issue is not related to theme, this is completely between the mailchimp and your webhost.
So try contacting mailchimp or your webhost on this.