Gmail – Sent mail ending up in trash

You could be in one of the following situations:

• you could have a keylogger/trojan on your computer;
• you could have logged in from a computer that had a keylogger/trojan installed;
• you could have been a phishing scam victim;
• you could have used a service that required your gmail account password (less likely) and they either store it in plain text and got hacked or were just rogue and sold/used it.

Now, you should:

• change all the passwords that you received on your gmail account, for each service/server;
• get in touch with any financial organization (e.g. banks) that might have sent you sensitive info on this email - if that's the case, follow bank account and credit card movements.

And last, you should switch to 2-step verification for your gmail account. Details are on gmail blog: http://googleblog.blogspot.com/2011/02/advanced-sign-in-security-for-your.html

Also, make sure your computer is clean - no viruses, trojans, keyloggers.

Edit:

It's also possible that you have the password stored in plain text and that file got somehow misplaced (trojan, file sharing error).

Gmail filters only act on messages when they arrive. There's not a way to do what you want with filters.

For a pure Gmail solution, you can accomplish almost what you want by judicious use of search and the Canned Responses Lab. That will make sending identical messages to a bunch of people relatively easy.

Another option would be to use some third-party tool. You can get your email via POP3 or IMAP, so virtually any desktop email client can get your messages. There are probably tools out there that will allow you to do what you're looking for. (That's outside the ken of WebApps, though.)

Alternatively, what you really need is a Customer Relationship Management (CRM) solution. Salesforce.com and its ilk probably already have the tools that you want.