When you compose your email message in SendBlaster, insert images by using “Image” button instead of using copy/paste; make sure they don’t have any “strange” characters in their name or path.
Another option would be creating the email template as an html page and then importing it into SendBlaster template engine.
We always suggest to put a html link in your mailings, pointing to a remote image on your webserver, here’s an example:
1.000 email x 100kb each one means a total of 100 MB of data to send, that means that your isp may block you in sending such amount of data.
You can also use SendBlaster as a software for sending HTML emails, text only emails and hybrid emails.