Build an Online Store

We are looking for someone to help us fixing two emails issues with OpenCart with Marketplace multivendor extension (developed by Webkul). The issues are: 1. The email (which contains the bill details) that should go to customers after purchasing is not working. However, there is an email (bill details) goes to admin's email. 2. The option to retrieve the user password is not working. No emails sent to reset the password when they press the link. All other emails are work well. Except the two emails I mentioned above. We are looking for a long term collaboration to maintain the website running and fix future issues.