Salesforce Governor Limits do not allow more than 10 calls to Messaging.sendEmail in a single transaction. There is a good chance that
calling this method in a loop will reach that limit and fail. You can instead send a batch of emails with a single call to
Messaging.sendEmail.
This rule raises an issue when a call to Messaging.sendEmail is found in a loop.
Noncompliant code example
trigger MyWelcomeTrigger on Contact (after insert) {
List<Id> toIds = new List<Id>();
for (Contact contact : trigger.new)
{
if(contact.Email != null)
{
Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
String[] toAddresses = new String[] { contact.email };
mail.setToAddresses(toAddresses);
mail.setSubject('Welcome');
mail.setPlainTextBody('Welcome');
Messaging.sendEmail(new Messaging.SingleEmailMessage[] { mail }); // Noncompliant
}
}
Compliant solution
trigger MyWelcomeTrigger on Contact (after insert) {
List<Id> toIds = new List<Id>();
for (Contact contact : trigger.new)
{
if(contact.Email != null)
{
toIds.add(contact.Id);
}
}
string templateName = 'Welcome Email Template';
EmailTemplate template = [select Id, Name from EmailTemplate where name = :templateName];
Messaging.MassEmailMessage mail = new Messaging.MassEmailMessage();
mail.setTargetObjectIds(toIds);
mail.setTemplateId(template.Id);
Messaging.sendEmail(new Messaging.MassEmailMessage[] { mail });
}
