NO_MASS_MAIL_PERMISSION Error from Unit Test on SingleMailMessage

Question

I am currently working in a Config-Only sandbox. I have a unit test that is continually failing with the following error message:

System.EmailException: SendEmail failed. First exception on row 0; first error: NO_MASS_MAIL_PERMISSION, Single email is not enabled for your organization or profile. Single email must be enabled for you to use this feature.: []

The interesting thing is that this unit test passes just fine in production. The unit test is for a batchable class. The error is occurring in the finish method on the Messaging.sendEmail(new Messaging.SingleEmailMessage[] { mail }); call. The finish method is:

global void finish(Database.BatchableContext bc) {
    AsyncApexJob a = [
        Select Id, Status, NumberOfErrors, JobItemsProcessed, TotalJobItems, CreatedBy.Email
        From AsyncApexJob
        Where Id = :bc.getJobId()
    ];

    // Send an email to the Apex job's submitter notifying of job completion.
    Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
    String[] toAddresses = new String[] {a.CreatedBy.Email};
    mail.setToAddresses(toAddresses);
    mail.setSubject('Batch job complete with status: ' + a.Status);        
    String body = 'Batch job completed.';
    body += '\nThe batch job processed ' + a.TotalJobItems + ' batches with '+ a.NumberOfErrors + ' failures.';
    body += '\nJob Results: ' + a.Id;
    mail.setPlainTextBody(body);
    Messaging.sendEmail(new Messaging.SingleEmailMessage[] { mail });
}

I recently refreshed the sandbox from production and made no permission changes, so I have no idea why one org would be failing while the other is working just fine. The user I am attempting to run this class with is a System Administrator. The System Administrator profile has the Mass Email and Send Email permission selected. Has anyone run into an error like this before?

Answer 1

Have you checked the "Access to Send Email" option under Administration Setup - Email Administration - Deliverability? It's new feature in Spring 13.

Answer 2

(Copying this answer from another question)

In Summer '14, (version 31.0), there is a new field available on the Organization object.

select Id, IsSandbox from Organization limit 1

From the release notes under New and Change Objects:

The Organization object has the following new read-only fields.

• InstanceName
• IsSandbox

You can for example create a static method that other classes can use like this:

public static Boolean runningInASandbox() {
  return [SELECT Id, IsSandbox FROM Organization LIMIT 1].IsSandbox;
}

You can then call that as a Boolean value:

if (!runningInASandbox()) {
  Messaging.SingleEmailMessage msg = new Messaging.SingleEmailMessage();
  msg.setSubject('An email');
  msg.setToAddresses(new List<String>{siteAdmin.Email});
  msg.setPlainTextBody('A message');
  Messaging.sendEmail(new List<Messaging.SingleEmailMessage>{msg});
}