Each time I see the Google Mail (or GMail in certain countries) Logo it reminds me on one of my earlier works I did:
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It’s a Logo for a PHP Mail Class called PHP Mailer, you can find it over there at Sourceforge.

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This is the Google Mail Logo. It’s not exactly the same, but the central part, the “M”, is: Recognizing the Letter as a central Part of an Envelope. That was the main Idea driving my creation long before Google Mail came live.