How to send image attachment with email template in magento 2

For Attach image in email template, you need to override TransportBuilder Class from Magento\Framework\Mail\Template\TransportBuilder

For Send Email Magento 2 without image attachment refer link,  Send Mail from Custom module Magento 2

For Override TransportBuilder.php file in Magento 2, you need to create di.xml file.
Using di.xml file you can override any PHP class in Magento 2.

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