How can I implement VERP (Variable envelope return

问题:

I want to implamant this bounce handling protocol in .NET but after I researched abit I found out that the basic classes that come with .NET don't support envelope assignment required by VERP

Is there a work around or another method?

回答1:

You can definitely implement VERP using System.Net.Mail, just generate a unique from address for each to address, then when the message bounces, your catch-all email account will receive it and you will know what to address to invalidate.

Here's a step-by-step example:

1. You will send an email to [e-mail].
2. You generate a random unique from address from a GUID, for example: [e-mail]
3. You keep a dictionary or database table that associates the from address above with the to address.
4. You receive a bounce email to a catch-all inbox where the recepient is [e-mail], therefore...
5. You invalidate [e-mail] in your DB.