In the finish method for a batch job it is common to send an email with code like:
global void finish(Database.BatchableContext BC){
// Get the ID of the AsyncApexJob representing this batch job
// from Database.BatchableContext.
// Query the AsyncApexJob object to retrieve the current job's information.
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('Apex Sharing Recalculation ' + a.Status);
mail.setPlainTextBody
('The batch Apex job processed ' + a.TotalJobItems +
' batches with '+ a.NumberOfErrors + ' failures.');
Messaging.sendEmail(new Messaging.SingleEmailMessage[] { mail });
}
Source - Using Database.BatchableContext.
When the email from Messaging.sendEmail arrives, how can the Org that sent it be identified?
Note that the question isn't specifically about batch jobs, they are just a common example of where the email would be sent (perhaps on a regular schedule) and the originating Org might be difficult to identify. In the above example it would be easy enough to append UserInfo.getOrganizationId() to the message body.
