Hi,

I had a big problem with opencart and zoho mail. When i finaly configured SMTP protocol (using this manual bdw)

Every time opecart tries to sen email to a customer i had an error 553 Relaying disallowed DATA not accepted from server.

This happens because opencart uses your contact mail value for "Mail From" attribute.

You have 2 ways to fix this:

1. Change contact mail to match a smtp account
   For example if your contact mail is "info@yourdomain.com", and you want the service to send emails about new users etc. from "no-reply@yourdomain.com". You need to change your contact mail to "no-reply@yourdomain.com"
2. Change system/library/mail.php

Replace this:

1.  public function setFrom($from) {
2.                 $this->from = $from;
3.         }
4. 
   
5.         public function setSender($sender) {
6.                 $this->sender = $sender;
7.         }

To this:

1.  public function setFrom($username) {
2.                 $this->from = $this->username;
3.         }
4. 
   
5.         public function setSender($username) {
6.                 $this->sender = $this->username;
7.         }

ATTENTION: You need to use your full mail as username at smtp configuration.

P.S. Sorry for my bad English. I hope this short manual will help you deal with problem :)