Not working on Magento 2.2

[lgrassini]

My Magento store stopped sending emails since I updated to Magento 2.2

The following error was reported on var/log/exception.log

[2017-10-19 00:09:43] main.CRITICAL: No body specified {"exception":"[object] (Magento\\Framework\\Exception\\MailException(code: 0): No body specified at /opt/bitnami/apps/magento/htdocs/vendor/magepal/magento2-gmailsmtpapp/Plugin/Mail/TransportPlugin.php:94, Zend_Mail_Transport_Exception(code: 0): No body specified at /opt/bitnami/apps/magento/htdocs/vendor/magento/zendframework1/library/Zend/Mail/Transport/Abstract.php:284)"} []

In the Mandrill application the API log is only showing the calls to /users/info.json. No calls to /messages/send.json since my upgrade to Magento 2.2.

When I try to send a test email (from Stores > Configuration > Mailchimp > Mandril) I got the following error message: "A technical problem with the server created an error. Try again to continue what you were doing. If the problem persists, try again later."

Attached to this issue the complete list of composer packages I have on my installation after the update.

Any idea what can be happening? or where I can look for any other error log?

Thanks in advance.

packages.txt

[lgrassini]

Solved. For some reason after the update to Magento 2.2 the Magento Gmail/Google Apps SMPT setting was enabled and active. Magento was trying to route my email this way instead of using Mandrill.

Disabling this setting made Magento to start sending the emails with the Mandrill extension and solved my problem.