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You can use email services to process the contents, headers, and attachments to the inbound email. For example, you can create an email service that automatically creates contact records based on the contact information in messages. Email service is using Apex classes to process the contents, headers, and attachments of the email automatically. You can associate each email service with one or more Salesforce-generated email addresses to which users can send messages for processing. The general template to create the apex class for the email services is:
To give multiple users access to a single email service, you can:
To use email services, from Setup, enter Email Services in the Quick Find box, then select Email Services.
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Salesforce uses two types of email service
Use Apex to work with an email sent from Salesforce. You can use Apex to send individual and mass emails. We can send Salesforce email templates and be in plain text or HTML format, or those generated by Visualforce.
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aSendEmailResult object. The syntax for sending an email is: Messaging.sendEmail(new Messaging.Email[]{mail},opt_allOrNone);
The following are methods for SingleEmailMessage. All are instance methods.
public class outboundemail {
public void myEmail(){
messaging.SingleEmailMessage email1=new messaging.SingleEmailMessage();
string[]toAdd=new string[]{'ganesh.maharana@janbask.com'};
string []ccAdd=new string[]{'subham.singh@janbask.com'};
email1.setToAddresses(toAdd);
email1.setCcAddresses(ccAdd);
email1.setSubject('Greeting from Janbask Training');
email1.setPlainTextBody('Janbask Training Career counselling');
email1.setSenderDisplayName('JanaBask Training');
messaging.Email[] emails = new messaging.Email[]{email1};
messaging.sendEmail(emails);
}
}
Output 
Mass EmailMessage We can send a mass email message to a recipient list consists of contact, lead, person’s account or user account are available in Salesforce. Messaging.massEmailMessageMethods: This method consists of three methods.
Example of MassEmail
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public class massEmailExample {
public void SendEmail()
{
List<contact>conlist=[Select id ,lastName from contact where lastNamelike'g%' ];
List<Id> ids= new List<Id>();
for(Contact c:conlist)
{
ids.add(c.id);
}
EmailTemplate tem=[Select id,name from EmailTemplate where name = 'Sales: New Customer Email' limit 1];
Messaging.MassEmailMessage Email = new Messaging.MassEmailMessage();
Email.setTargetObjectIds(ids);
Email.setSenderDisplayName('System Admin');
Email.setTemplateId(tem.id);
Messaging.sendEmail(new Messaging.MassEmailMessage[] { Email });
system.debug(Email);
}
}
Run Code
massEmailExamplevv = new massEmailExample();
vv.sendEmail();
system.debug(vv);
Output 
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| SINGLE EMAIL | MASS EMAIL | |
| Multiple recipients? | Yes | Yes |
| Personalized body? | Yes (single body only) | Yes |
| Special permission needed? | No | Yes, has to be enabled |
| Merge fields? | Yes | Yes |
| Personalized merge fields? | Yes (only one record at a time) | Yes |
| Templates? | Yes | Yes |
| Template possibilities? | Text/HTML/Visualforce/Custom Templates | Text/HTML/Custom Template |
Read: What is Scheduled Apex in Salesforce?
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