How to embed images in MIME mail system?
With the help of Rules module and filtered HTML text format allowing img tag in the format you could send HTML emails with images.

Here is a summary of the required steps:


Enable the required modules, eg using Drush like so: drush dl rules entity mimemail mailsystem
Configure the MAIL SYSTEM SETTINGS choosing MimeMailSystem the Site-wide default and Mime Mail module class from admin/config/system/mailsystem
Set the text format to be filtered html or the format that allows img tag from admin/config/system/mimemail
Use Rules to send html e-mails.


For a more detailed tutorial, refer to How to Send HTML Emails in Drupal 7 using Rules.