A Colour Classic II is quite old for Gmail, and I would suggest upgrading to a 68040 (Mystic upgrade) for Gmail. Your best bet would be Baton Mail or something like that.
Also, have you considered running System 7.5.4? http://www.fenestrated.net/~macman/SysReview/#Summaryis a good explanation of why. I have 7.5.4.
Also, have you considered running System 7.5.4? http://www.fenestrated.net/~macman/SysReview/#Summaryis a good explanation of why. I have 7.5.4.