I am having problem with Gmail

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For past few days I am having problems with Gmail account, when I want to send a mail, type and ‘send’ it says, ‘oops your mail could not be sent due to server error, next says 404 error, page not found’; this happened many times. Next it says, try new format, here a small window appears on bottom right hand side, I typed there, attached a file, sent , it reached destination, but the attachment, which is only 515KB missing. [b]Has anyone faced it, what might be the reason? How to solve this? Which email you use? I use Gmail, yahoo and rediffmail. Please comments on this please.[/b] Thanks in advance. Professor Dr. B.Saraf. PhD. Cheers have a lucky day ahead. January 11th 2013. [i][/i]