HI 
Below is my code.
 
public class LeadEmail
{
public static void SendEmailTolead(list<lead> lstLead)
{
    if(! lstLead.isEmpty())
   {
        list<messaging.SingleEmailMessage> lstEmails = new list<messaging.SingleEmailMessage>();
    for(lead lr : lstLead)
    {
        messaging.SingleEmailMessage email = new messaging.SingleEmailMessage();
        string[] toEmailsIds = new string[]{lr.Email};
            email.settoAddresses(toEmailsIds);
        
        
        email.setSenderDisplayName('lead Record Creation Alert');
        
        email.setReplyTo('support@RFI.com');
        
        string emailsubject = 'congralutions'+lr.Name+'you have been registerd';
        
        email.setSubject(emailsubject);
        
        string emailHTMLContent = 'Dear'+lr.name+',<br/> <br/>'+
               '<br/><br/> here are your details... <br/><br/>'+
            
                '<br/> Your Company....'+lr.Company+
                '<br/> Your tile for the Role'+lr.Title+
                '<br/> your Status for The record'+lr.Status+
            'thanks & Regards';
        
        email.setHtmlBody(emailHTMLContent);
        
        lstEmails.add(email);
        
    }
   if(!lstEmails.isempty())
    {
        Messaging.sendEmail(lstEmails);    }
    
    } 
}
}

Execute window

list<lead> lstLead = [select id,name,email,company,title,status from lead];
LeadEmail.SendEmailTolead(lstLead);



Getting error 
Line: 38, Column: 1
System.EmailException: SendEmail failed. First exception on row 5; first error: SINGLE_EMAIL_LIMIT_EXCEEDED, Email limit exceeded: []

Any assistance

​​​​​​​Thanks in advance