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Being over quota means you've received or kept too much email. Dealing with an email quote means understanding just where that email is being kept.
After I did a recovery on my computer, Outlook Express has not worked properly as far as the inbox is concerned. I used to be able to get 700-800 or more emails in my inbox (if I went on vacation or didn't check for a while) and after the recovery once I reached about 80 emails it started bouncing my messages saying I was OVER QUOTO!!! How can that be? It is getting worse now. I can have only 40 messages in my inbox and it will start bouncing my messages, still saying I am OVER QUOTO! Soon, I won't get ANY messages!
A couple of clarifications:
First, it's over quota, not quoto.
Second, believe it or not, being over quota has nothing to do with the inbox on your PC, or even what email program you're using.
But it might have everything to do with how your email program is configured.
A quota is nothing more than a limit of how much disk space your email can take up. The catch is that it's not on your machine, but on the servers of your email service provider. It's your email service provider that imposes a quota. That could be Hotmail, Yahoo, GMail, or the email provided by your company, your ISP or whomever else you're using for your email.
For example, in GMail I have this message at the bottom of the page:
That means I have a space quota of 7326 MB, or right around 7 gigabytes. Presumably, if I exceed that limit GMail will start rejecting email sent to me.
And that's the big clue in your question: Outlook Express does not "bounce" email - your email provider does. So if a bounce is being created, then it's being detected by your mail server before your mail program is even involved.
The most common cause for being over quota? Going on vacation.
When you go on vacation you don't download email, so it accumulates ... at your email provider. If while you're away the email you receive exceeds the amount of space the email provider has set aside for you, you're over quota and further emails will typically get bounced back to the sender.
The only real solution is to ask for a larger quota, check, download or clean up your email from time to time while you're away, or move to an email provider with a larger, or no quota.
Now, it sounds like you may have a little more going on, since after getting back and presumably downloading your email you're still running into trouble.
There are two likely possibilities: you're using IMAP instead of POP3 to download into Outlook Express, or you've got a particular setting in your POP3 configuration.
When you set up your email account in Outlook Express (or any of several other email programs), one of the configuration options you needed to specify was what type of email server you've been provided:
IMAP by definition leaves all the messages that you don't delete on the email service provider's servers in addition to downloading to your email client. In this case, the act of downloading and viewing your email doesn't free up any space against your quota, only actually deleting messages will do that.
If you use IMAP and are reaching your provider's email quota, you have three options to resolve the issue:
Remember that if you download email to your computer using POP3, you need to take responsibility for backing it up. You should be backing up anyway, but this is a great example: if you've downloaded your email and your hard disk dies all your email will be gone. (Along with all your documents, settings, and whatever else is on your computer.) Backup.
Speaking of POP3, there is an obscure setting that I occasionally see set when people don't expect it. In Outlook Express it's located in Tools, Accounts..., (click on your mail account), Properties, Advanced. In that dialog you'll see this:
And it does pretty much exactly what you'd think: rather than removing the messages from your mail server when you download, it leaves them there so that they continue to count against your quota.
The odd thing is that this is not the default setting, so before changing it you'll want to check out why it was set in the first place. But the bottom line is that like IMAP you'll need to start deleting messages (after saving what you want to save elsewhere), or turn this option off and rely on your PC to keep all your email.