Please post the complete error message.
How to troubleshoot error messages that you receive when try to send and
Your current Identity may have been corrupted by 'Norton' (AntiVirus?),
especially if its the default Main Identity. Try one or more of your
accounts in a new Named Identity (File>Identities>Add new identity).
Assuming all is well, import messages from the old Identity before deleting
it (File>Identities>Manage Identities).
To avoid such corruption in future:
Don't use Inbox or Sent Items to archive messages. Move them to local
folders created for this purpose.
Empty Deleted Items folder daily.
Disable Background Compacting [N/A in SP2] and frequently perform a manual
compact of all OE folders while "working offline". More at
Your anti-virus application's email scanning feature can also cause such
corruption. Disable it. It provides no additional protection.
~Robear Dyer (PA Bear)
MS MVP-Windows (Shell, IE/OE) & Security
> Hello, I've got this problem sending mail which only began today and is
> definitely a local issue on my laptop.
> How'd I know? Because"
> -- I'm able to send using my main Desktop and
> -- 'and I'd installed the newest version of Norton Antivirus over a week
> ago on this machine only. (quite possibly the cause of my problems??)
> Anyhow, I've tried disabling Norton and Webroot SpySweeper and nothing.
> funny though how this problem only began today.
> Below is the error message I get.
> Any suggestions would be greatly appreciated.
> """An unknown error has occurred..............................Protocol:
> SMTP, Port: 25, Secure(SSL): No, Error Number: 0x800CCC0B"""