I am using SMTP pro extension for managing emails.

Customer email confirmation was working fine previously, although no configuration was changed, i am having issue with order email confirmation. Test email is working fine with SMTP pro extension but email is not sent upon placing order.

In log exception, i get exception error: exception 'Zend_Mail_Exception' with message 'Subject set twice' in /xyz.com/lib/Zend/Mail.php:721.

I am working on the version 1.4.x, so i don't think there is cron issue with this version in order confirmation.

2 Answers 2


Is your cron running? Magento 1.9's order emails are placed in a queue that gets processed via a Magento cronjob.

  • sorry i forgot to mention, the version i am working now is in 1.4.1
    – Armed
    Commented Dec 29, 2015 at 8:42
  • Wow.. you should upgrade
    – Erfan
    Commented Dec 29, 2015 at 14:16
  • yup, i am migrating the site to 1.9.x in local, but the client had issue in the live site which is in 1.4
    – Armed
    Commented Dec 31, 2015 at 6:01
  • Upgrading will probably fix it..
    – Erfan
    Commented Dec 31, 2015 at 7:33

So happens to be the client set the Authentication to none in SMTP email tab in configuration > Advanced > System.

Selecting the authentication to login now and email confirmation is sent.

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