Gmail made some recent changes to its security settings for email.  You may find that when you send test or actual email messages from MyMedLeads to gmail addresses that the images don't appear.

What you'll see:  It used to be possible in Gmail to either download email images via right-click OR to have your Gmail settings allow images to display without right-clicking. With the new security setting, some images might be completely blocked with no way to right-click, regardless of your Gmail images settings.

MyMedLeads has found that the problem occurs if you are using images that you uploaded directly from your computer.  If the name of the image contains spaces, gmail will not display them. 

It may be that locally uploaded images may cause problems in gmail for other reasons too. If you use a URL image address (link) to a hosted location to add your images, the Gmail problems don't occur.