I feel I didn't do a good job on the original, so I redid it. A few months late, but there's no time requirement.

A set of logos for a mail folder suggested/requested by user cazbar here and inspired by my own community folder logo.

The logos used:
gMail
Aol (I rotated the logo to make it look like an A)
Yahoo! (Inverted the exclamation point to make it look like an I)
maiL.com

All logos with and without reflection

1&2 - Regular Logos
3&4 - Black and White Logos
5&6 - Logos with black outline
7&8 - Logos with bevel

Inspired by Mafia_Penguin's logo here.

Several logos for mail folders, all tranparent, made with different effects.

M - GMail
A - AOL
I - The old hotmail logo
L - Yahoo Mail

#1 - Reflection
#2 - Reflection, 60% Opacity
#3 - Reflection, Inner Bevel
#4 - Reflection, Inner Bevel, 60% Opacity
#5 - Drop Shadow

M-gMail
A-Aol
I-mail.com
L-gMail

Sorry about the tiny logos (: