How to Send Email To Non Contacts Using Apex Salesforce

Using renderStoredEmailTemplate(templateId, whoId, whatId) method of Messaging Class, we can send email to non contacts using apex.

Sample code:

//Send email to record owner

Messaging.SingleEmailMessage mail = Messaging.renderStoredEmailTemplate(emailTemplateId, ownerId, opportunityId);

mail.setTargetObjectId(ownerId);

mail.setSubject(mail.getSubject());

mail.sethtmlBody(mail.gethtmlBody());

mail.saveAsActivity = false;

Messaging.sendEmail(new Messaging.SingleEmailMessage[] {mail});