The idea: since you can’t put Google Analytics into an email, because it’s based on Javascript which you can’t run there, put an image pixel tracker into your email signature instead.
<img src=”http://www.google-analytics.com/collect?v=1&tid=UA-XXXXXXX-1&cid=69696969&t=event&ec=email&ea=open&el=recipient_id&cs=TomsEmailSignature&cm=email&cn=TomsEmailSignature&dp=/virtual/email-open&dl=rollup.tomachi.co”>
Some useful customisations worth mentioning
Document Path:
To set a virtual page, I always use /virtual/email-open with this: &dp=/virtual/email-open
To set a virtual domain, lets say rollup.tomachi.co use: &dl=rollup.tomachi.co
Pixel here: .
Read more: http://dyn.com/blog/tracking-email-opens-via-google-analytics/