Disable email scanning by your anti-virus application.  It provides no
additional protection and even Symantec says it's not necessary:

<paste>
Disabling email protection does not leave you vulnerable to viruses and
malicious software in email. It is a separate layer of protection in
addition to Auto-Protect. Auto-Protect scans any incoming files, including
email, as they are saved to your hard drive. As long as you keep your virus
definitions up to date with LiveUpdate, and keep Auto-Protect enabled and
set to scan files as they are created or downloaded, your system is fully
protected.
</paste>
http://service1.symantec.com/SUPPORT/nav.nsf/df0a595864594c86852567ac0063608c/65
434372961d321d8825687f000003f8

Time-Out Error 0x8004210a or 0x800ccc19 When You View a POP3 E-Mail Account
with AntiVirus Software Installed
http://support.microsoft.com/?kbid=813518

It's a problem with McAffee.  See this KB article for a fix:

834365 - You receive a “Connection Error: 0x800ccc19 – The connection to the
Server times out” error message when you send or receive e-mail:
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q834365

I think that the phone line you are now connected to is a bit noisier.  On
top of that, you probably have your anti-virus set to scan email.  Both of
these slow down the connection and the combination is enough that OE times
out.

Turn off email scanning in your anti-virus.  It provides no added
protection.
Email scanning slows down Sending and Receiving, sometimes enough that OE
times out.  Since some of the received messages have large (often virus)
attachments, which exasperates the problem.
Some Comcast users have found it necessary to totally uninstall Norton and
switch to the free AVG with mail scanning off.  Norton invented email
scanning and here's what they say:
From
http://service1.symantec.com/SUPPORT/nav.nsf/df0a595864594c86852567ac0063608c/65
434372961d321d8825687f000003f8?OpenDocument&src=tr&Highlight=0,email,protection

"Disabling email protection does not leave you vulnerable to viruses and
malicious software in email. It is a separate layer of protection in
addition to Auto-Protect. Auto-Protect scans any incoming files, including
email, as they are saved to your hard drive. As long as you keep your virus
definitions up to date with LiveUpdate, and keep Auto-Protect enabled and
set to scan files as they are created or downloaded, your system is fully
protected."

See also
http://help.expedient.com/mailnews/norton_antivirus.shtml
and
http://service1.symantec.com/SUPPORT/nav.nsf/pfdocs/1999092910223606?Open
and
http://service4.symantec.com/SUPPORT/nav.nsf/docid/2000020716064206&src=w
So Symantec used to say this often and clearly.  The newer stuff doesn't
have the statement included as it was considered an embarrassment.  If you
know anyone who programs for Norton try to get them to talk about it.