images in html email: attached or inline?

[eluser]stef25[/eluser]
Im trying to set up a recommend-to-friend feature using CI. the sent message will be a full HTML template. I know you can either use inline images, or attached ones.

In the case of attached images – I attach the images to the mail using $this->email->attach($file1) and then as the scr attribute of my image tag i use a cid value? if so, how do i assign a cid value to the attached image via CI?

And in the case of inline images, I use a path on the live server as the src attribute of my img tags, starting with http://mydomain.com/... and no attachments are required – is this correct?

I'm having some issues getting attachment to work but I'd first like to clarify the above before figuring out what the problem is. perhaps i dont need to use attachments.

thanks for any info on this, stef