Error 0x800CCC0B BUSY Server or maildrop is busy when sending email

A customer has new brand new Dell laptop with Windows XP SP2 (and therefore
IE6 and OE6) and McAfee Security Center (not sure which version: its Help |
About doesn't say!).

I've set him up with a dial-up account with the same ISP that I use, as a
stop-gap until his broadband account with that ISP is activated, and
configured OE as for my PC (in terms of POP and SMTP servers).

OE is *usually* (but not 100% of the time) refusing to send emails, although
receiving works fine.

With McAfee enabled, OE reports no errors but McAfee reports a non-specific
"Protocol Error". I think this is masking the root cause: when I disable
McAfee AV, OE reports error 0x800CCC0B which MS's Knowledge Base says means
"Server or maildrop is busy".

I've established:

- It's not due to OE's stupid "hang up line when finished
sending/receiving": the line definitely stays up all the time.

- If I start OE and prepare just one message, it sends OK. If I prepare more
than one message, the first will send but the others encounter the error. If
I prepare and send one message (which succeeds), I cannot send subsequent
messages within the same session of OE. Restarting OE (with no messages
queued in the Outbox) usually clears the error and allows one (and only one)
message to be sent. Very weird.

- The SMTP server is definitely working. My own PC can send to it without
any problem.



Has anyone encountered this error 0x800CCC0B and do they know what the fix
is?

The entries on the Accounts | Servers page definitely match those on my PC
which works. The SMTP server (relay.force9.net) does not require
username/password authentication so that feaure is not enabled. The PC is
connected using the ISP that owns the SMTP server, so it's not the old "send
from a 'foreign' ISP problem".



.

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