Hi Bala,

Based on your suggestion... i have tried creating the visualforce page and an apex class... But how can i select one attachment from the visualforce page and send it as an attachment inside mail??? is getting difficult

The Apex class is:

public class testmail
{
 ApexPages.StandardController controller;   
 
 public opportunity_proposals__c q
 {
 get;set;
 }
    
 String op = ApexPages.currentPage().getParameters().get('id');
 
 public Id oppr   
 {    get;set;    }       
 
 public testmail(ApexPages.StandardController ctrl)   
 {      
 oppr = ctrl.getRecord().Id;        
 }
 
 public PageReference emailAtt()
 {
 
 Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
        String[] toAddresses = new String[]{'SMaster@gmail.com'};
        mail.setToAddresses(toAddresses);
        mail.setReplyTo('SMaster@gmail.com');
        mail.setSenderDisplayName('CRM Support');
        mail.setBccSender(false);
        mail.setUseSignature(false);
        mail.setTargetObjectId('005Q0000000FR7f');
        mail.setTemplateId('00XQ0000000QULj');
        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 });
        return null;
}
}

and the Visualforce page is:

<apex:page standardController="opportunity_proposals__c" extensions="testmail">
  <apex:form >
   <apex:pageBlock title="Attachments">
   <apex:pageBlockButtons >
            <apex:commandButton value="Send" action="{!emailAtt}"/>
        </apex:pageBlockButtons>

     <apex:pageBlockTable value="{!opportunity_proposals__c.Attachments}" var="Att">
     <apex:column headerValue="Select">
            <apex:inputCheckbox value="{!opportunity_proposals__c.for_sendemailwithattachment__c}"/>
        </apex:column>
       <apex:column value="{!Att.createddate}"/>
       <apex:column value="{!Att.name}"/>
       <apex:column value="{!Att.description}"/>
     </apex:pageBlockTable>
     
      </apex:pageBlock>

  </apex:form>
</apex:page>