I get this when I forward more than two or three emails.
An error occurred while sending mail. The mail server responded: 4.3.2 STOREDRV.ClientSubmit; sender thread limit exceeded. Please verify that your email address is correct in your account settings and try again.
An error occurred while sending mail. The mail server responded: 4.3.2 STOREDRV.ClientSubmit; sender thread limit exceeded. Please verify that your email address is correct in your account settings and try again.
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I'm not sure if this will help, but for IMAP accounts you can specify the maximum number of server connections. Try going to Tools > Account Settings > [account name] > Server Settings > Advanced and decrease the value of "Maximum number of server connections to cache". HTH