Hello All,
I am fetching contacts and few email from custom lables to send an email from singlemailmessge but i am receiving several times .can any one help me to fix this issue.


public class IncidentTriggers {
    public static void SendEmailtoSiteCOntact(List < Incident__c > lnewind) {
    
    Map < ID, ID > mCaseIDtoSiteContID = new Map < ID, ID > ();
    Map < ID, Incident__c > mSiteIDtoIncident = new Map < ID, Incident__c > ();
    
 try{
 //Find all Incident__cs with Sites
    for (Incident__c c: lnewind) {
    if (c.Site__c != null) {
    system.debug('incident:' + c.ID);
    system.debug('Incident__c.Site__c:' + c.Site__c);
    mCaseIDtoSiteContID.put(c.ID, c.Site__c);
    system.debug('values in the map'+mCaseIDtoSiteContID);
    system.debug('incidnetid:' + mCaseIDtoSiteContID.get(c.id));
    //mSiteIDtoIncident.put(c.Site__c, c);
    }

 //-----------------------------------

 //Find All Site_Contacts referenced in the above incidents
 List < Site_Contact__c > lSContacts = [SELECT ID, Site__c, Role__c, Contact__c, contact__r.Email, Transfer_To_Customer_Complaint__c, Transfer_To_Supplier_Complaint__c, Transfer_To_Product_Specification__c FROM Site_Contact__c WHERE Site__c in : mCaseIDtoSiteContID.values()];

 //Incident__c c = mSiteIDtoIncident.get(sc.Site__c);


    List<Messaging.SingleEmailMessage> mails = new List<Messaging.SingleEmailMessage>();
    string address1=label.Incident_Manager1;
    string address2=label.Incident_Manager2;
    string address3=label.Incident_Manager3;
    string addresses=address1+':'+address2+':'+address3;
    for (Site_Contact__c sc: lSContacts) {
    if (sc.contact__r.Email != null || sc.contact__r.Email != 'null') {         
    addresses = addresses + ':' + sc.contact__r.Email;
    system.debug('intial Email Address Information ' + addresses);
    List < String > emailAddresses = new List < String > ();
    emailaddresses = addresses.split(':', 0);
    system.debug('final list of Email Address Information ' + emailaddresses);
    Messaging.SingleEmailMessage email = new Messaging.SingleEmailMessage();
    EmailTemplate et = [SELECT Id ,name FROM EmailTemplate WHERE Name = 'Test Template for incident'];
    email.ToAddresses = (emailaddresses);
    email.setTemplateId(et.Id);
    email.setSaveAsActivity(false);
    email.setTargetObjectId(sc.contact__c);
    email.setOrgWideEmailAddressId('0D2200000004EQx');
    email.setwhatid(c.id);
    mails.add(email);
    }
    }
    
    }
    Messaging.sendEmail(mails); 
}
    
catch(Exception ec)
       {    
          system.debug('error is' + ec);
        }

    
   }
}

Regards,
Krishna