I recently switched over to Zoho Invoice.  I am having trouble with my clients not being able to respond to the invoice email. they are receiving a bounce back email . Please help, this is affecting my business. 

The response from the remote server was:

• I am successfully receiving email replies from all other emails, except Zoho invoice emails
  
• I can successfully send an invoice with the email template from Zoho, however I cannot receive any email replies
  
• I have been in contact with my domain provider who has configured the SPF and DKIM settings and i have authenticated in zoho successfully.