On: What's in email tracking links and pixels?

[crispyporkbites]

If it's just one or a handful of emails, or a small image, attach the image and use it's Content ID to refer to it in the HTML of the email:

<img src="cid:some-image-cid" alt="img" />

pretty much all email clients support it

[dynm → crispyporkbites]

Thanks! Do you think this might increase the odds of the email going to spam? (This might be why you mentioned not having too many images.)