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Apex developer 21Apex developer 21 

Exmple how to send notes and attachments form quotes

Can someone give an example how to attach attachments form Quotes to a visualforce email template so that an external receiver kan download the attachments. I have seen many examples but they all require the recever to login to be able to download the. I have found the following example but dont know how to apply this for a visualforce emailtemplate on quotes as a newbie see:
Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
        String[] toAddresses = new String[]{'user@dimain.com'};
        mail.setToAddresses(toAddresses);
        mail.setReplyTo('user@domain.com');
        mail.setSenderDisplayName('SFDC Support');
        mail.setBccSender(false);
        mail.setUseSignature(false);
        mail.setTargetObjectId('005Q0000000Fo7f');
       // Give visualforce template id
        mail.setTemplateId('00XQ0000000iULj');
        mail.saveAsActivity = false;    
        
      //Set email file attachments
        List<Messaging.Emailfileattachment> fileAttachments = new List<Messaging.Emailfileattachment>();
        for (Attachment a : [select Id, Name, Body, BodyLength from Attachment where ParentId = :oppr])
        {
     // Add to attachment file list
        Messaging.Emailfileattachment efa = new Messaging.Emailfileattachment();
        efa.setFileName(a.Name);
        efa.setBody(a.Body);
        fileAttachments.add(efa);
        }
        mail.setFileAttachments(fileAttachments);

      //Send email
        Messaging.sendEmail(new Messaging.SingleEmailMessage[] { mail });