Do you want to know whether your email was opened — for sure? Do you want to find out whether it has been forwarded, or prevent recipients copying or printing the information? Do you want to send self-destructing email? Certified email, email tracking and email read notification services let you do all that and often a lot more. Find the best services with my top picks.

Heinz TschabitscherReadNotify is an extremely sophisticated certified email service that has options to let you know whether an email you sent was opened under all circumstances and provides proof of your sending, too, while hiding most of the complexity behind easily accessible plug-ins, tools and email shortcuts.

Heinz TschabitscherE-mailSecure is a highly flexible email return receipt service that lets you know when your messages are opened and can proof both email sending and opening. While E-mailSecure lets you exert considerable control over your messages, it does interfere with normal email workflow.

Heinz Tschabitscherpointofmail is a very comprehensive proof of receipt and reading service for email. Though easy to use, pointofmail can ensure read receipts, tracks attachments and lets you modify or delete sent messages. Unfortunately, working with pointofmail-certified mail can be cumbersome, and most pointofmail modes do not inform the recipient they are watched.

Heinz TschabitscherBigString.com is a free 1 GB email service that includes rich certified mail services and lets you expire or edit sent messages, for example. Unfortunately, BigString.com is not equally well equipped for handling incoming mail and lacks organizing tools.

Heinz TschabitscherSpyPig lets you set up small images which, added to outgoing emails, tell you when these messages have been opened.
SpyPig is best for the occasional mail, though, as it requires some action per message. There's also no way to make SpyPig work when the recipient does not download the image, so SpyPig is not fully certified email.

Heinz TschabitscherConfimax makes it easy to receive return receipts as soon as the recipient opens a messages. Unfortunately, these receipts aren't guaranteed

Heinz TschabitscherDidTheyReadIt makes it really easy to know if and when an email you sent was opened. Unfortunately, DidTheyReadIt is problematic as recipients have no idea their actions are recorded and there is no way to opt out of DidTheyReadIt return receipts.