Email not sending after upgrading magento version 2.2.4 to 2.3.1

Question

Currently, using Mandrill for email flows and it's working fine before upgrade the Magento. My previous version is 2.2.4 and upgraded to 2.3.1.

After upgrade, the Magento emails are not getting flow.

When I am debugging the problem than I knew something like

I am getting an error like

Invalid sender

from_email and from_name not getting is the main error.

Please help me, anybody, if any idea of this bug.

Thank you

Answer 1

Above issue is resolved :

I have replaced the Mandrill module with a compatible 2.3.1 module.

https://github.com/ebizmarts/magento2-mandrill/tree/compatibility231

And added mandrill library using composer

composer require mandrill/mandrill

Now it's working like a champ.