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Thanks in advance for your help!

Here's all the info you requested. Thanks.

 Application Basics

   Name: Thunderbird
   Version: 24.4.0
   User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:24.0) Gecko/20100101 Thunderbird/24.4.0
   Profile Folder: Show in Finder
   Application Build ID: 20140316131045
   Enabled Plugins: about:plugins
   Build Configuration: about:buildconfig
   Crash Reports: about:crashes
   Memory Use: about:memory

 Mail and News Accounts
   account1:
     INCOMING: account1, , (pop3) pop.sbcglobal.yahoo.com:995, SSL, passwordCleartext
     OUTGOING: smtp.sbcglobal.yahoo.com:465, SSL, passwordCleartext, true

   account2:
     INCOMING: account2, , (none) Local Folders, plain, passwordCleartext

   account3:
     INCOMING: account3, , (imap) imap.googlemail.com:993, SSL, passwordCleartext
     OUTGOING: smtp.googlemail.com:465, SSL, passwordCleartext, true

   account4:
     INCOMING: account4, , (imap) mail.rottell.com:143, SSL, passwordCleartext
     OUTGOING: host354.hostmonster.com:465, SSL, passwordCleartext, true

   account5:
     INCOMING: account5, , (pop3) mail.rottell.com:110, plain, passwordCleartext
     OUTGOING: mail.rottell.com:587, alwaysSTARTTLS, passwordCleartext, true

 Extensions

 Important Modified Preferences

   Name: Value

     browser.cache.disk.capacity: 358400
     browser.cache.disk.smart_size_cached_value: 358400
     browser.cache.disk.smart_size.first_run: false
     browser.cache.disk.smart_size.use_old_max: false
     extensions.lastAppVersion: 24.4.0
     gfx.blacklist.direct2d: 3
     gfx.blacklist.layers.direct3d9: 3
     gfx.blacklist.webgl.msaa: 4
     mail.openMessageBehavior.version: 1
     mail.spotlight.firstRunDone: true
     mailnews.database.global.datastore.id: 592b4775-d3e7-f84e-a94c-eb6f26f6a46
     network.cookie.lifetimePolicy: 2
     network.cookie.prefsMigrated: true
     places.database.lastMaintenance: 1397197635
     places.history.expiration.transient_current_max_pages: 104858
     plugin.importedState: true
     privacy.donottrackheader.enabled: true

 Graphics

     Vendor ID: 0x1002
     Device ID: 0x94c8
     WebGL Renderer: false
     GPU Accelerated Windows: 0

     AzureCanvasBackend: quartz
     AzureFallbackCanvasBackend: none
     AzureContentBackend: none

 JavaScript

 Incremental GC: 1

 Accessibility

   Activated: 0
   Prevent Accessibility: 0

 Library Versions

     Expected minimum version
     Version in use

     NSPR
     4.10.2
     4.10.2

     NSS
     3.15.4 Basic ECC
     3.15.4 Basic ECC

     NSS Util
     3.15.4
     3.15.4

     NSS SSL
     3.15.4 Basic ECC
     3.15.4 Basic ECC

     NSS S/MIME
     3.15.4 Basic ECC
     3.15.4 Basic ECC

Please note: the original DrSteve mailbox was renamed to #2 in an attempt to change to POP from imap to see if this helped. The should ideally only be one DrSteve mailbox. - thanks.

Sorry. I guess they would be the mail.rottell.com mailboxes. - thanks.

did you new U-verse come with an update to your anti virus? Given the MCAfee product they are giving away has just released a rather bad update, we might be looking in the wrong place.

No new software was loaded on my system. I do not use MCAfee antivirus, I do use Avast.

just try disabling the A/V and see if it might be at issue. It might not like something that changed.

That seemed to do it. Never would have found that on my own. Thanks!