Hmm is the email account not a RR account perhaps?

Just a guess on my part, but Comcast did something similar some years ago. The released a modem that blocked email ports. A couple of years letter they changed the ports they used and locked out their own customers.

Exactly what error are you getting?

What ports are being used for mail? Does the new modem actually allow those ports? (TWC can tel you.)

Re what ports....The following will answer that question.

Please add the troubleshooting information to your post To find the Troubleshooting information:

• Open Help (or click on three-line-icon and select Help)
• Choose Troubleshooting Information
• Use the button Copy to clipboard to select all. Do not check box "Include account names"!

The email is a Thunderbird account, carried by RR. I hit send and it says connected to smtp-server.san.rr.com, but it times out. Port 110. Same as my wife's computer and Thunderbird account.

 Application Basics

   Name: Thunderbird
   Version: 45.2.0
   User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0
   Profile Folder: Show Folder

             (Local drive)
   Application Build ID: 20160630070546
   Enabled Plugins: about:plugins
   Build Configuration: about:buildconfig
   Memory Use: about:memory

 Mail and News Accounts
   account1:
     INCOMING: account1, , (pop3) pop-server.san.rr.com:110, plain, passwordCleartext
     OUTGOING: , smtp-server.san.rr.com:25, plain, passwordCleartext, true

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

   account3:
     INCOMING: account3, , (nntp) news.mozilla.org:119, plain, passwordCleartext
     OUTGOING: , smtp-server.san.rr.com:25, plain, passwordCleartext, true

   account4:
     INCOMING: account4, , (pop3) pop-server.san.rr.com:110, plain, passwordCleartext
     OUTGOING: , smtp-server.san.rr.com:25, plain, passwordCleartext, true
     OUTGOING: , smtp-server.san.rr.com:25, plain, passwordCleartext, false

   account5:
     INCOMING: account5, , (pop3) pop-server.san.rr.com:110, plain, passwordCleartext
     OUTGOING: , smtp-server.san.rr.com:25, plain, passwordCleartext, true

   account6:
     INCOMING: account6, , (pop3) pop-server.san.rr.com:110, plain, passwordCleartext
     OUTGOING: , smtp-server.san.rr.com:25, plain, passwordCleartext, true

   account7:
     INCOMING: account7, , (pop3) pop-server.san.rr.com:110, plain, passwordCleartext
     OUTGOING: , smtp-server.san.rr.com:25, plain, passwordCleartext, true

   account8:
     INCOMING: account8, , (pop3) pop-server.san.rr.com:110, plain, passwordCleartext
     OUTGOING: , smtp-server.san.rr.com:25, plain, passwordCleartext, true

   account9:
     INCOMING: account9, , (pop3) mail.savelajollaseals.org:110, alwaysSTARTTLS, passwordCleartext
     OUTGOING: , mail.savelajollaseals.org:25, alwaysSTARTTLS, passwordCleartext, true

   account10:
     INCOMING: account10, , (pop3) pop.secureserver.net:110, plain, passwordCleartext
     OUTGOING: , smtpout.secureserver.net:465, SSL, passwordCleartext, true

 Crash Reports

 Extensions
   Lightning, 4.7.2, true, {e2fda1a4-762b-4020-b5ad-a41df1933103}

 Important Modified Preferences

   Name: Value

     accessibility.typeaheadfind.flashBar: 0
     browser.cache.disk.capacity: 358400
     browser.cache.disk.filesystem_reported: 1
     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
     dom.apps.reset-permissions: true
     extensions.lastAppVersion: 45.2.0
     font.internaluseonly.changed: false
     font.name.monospace.el: Consolas
     font.name.monospace.tr: Consolas
     font.name.monospace.x-baltic: Consolas
     font.name.monospace.x-central-euro: Consolas
     font.name.monospace.x-cyrillic: Consolas
     font.name.monospace.x-unicode: Consolas
     font.name.monospace.x-western: Consolas
     font.name.sans-serif.el: Calibri
     font.name.sans-serif.tr: Calibri
     font.name.sans-serif.x-baltic: Calibri
     font.name.sans-serif.x-central-euro: Calibri
     font.name.sans-serif.x-cyrillic: Calibri
     font.name.sans-serif.x-unicode: Calibri
     font.name.sans-serif.x-western: Calibri
     font.name.serif.el: Cambria
     font.name.serif.tr: Cambria
     font.name.serif.x-baltic: Cambria
     font.name.serif.x-central-euro: Cambria
     font.name.serif.x-cyrillic: Cambria
     font.name.serif.x-unicode: Cambria
     font.name.serif.x-western: Cambria
     font.size.fixed.el: 14
     font.size.fixed.tr: 14
     font.size.fixed.x-baltic: 14
     font.size.fixed.x-central-euro: 14
     font.size.fixed.x-cyrillic: 14
     font.size.fixed.x-unicode: 14
     font.size.fixed.x-western: 14
     font.size.variable.el: 17
     font.size.variable.tr: 17
     font.size.variable.x-baltic: 17
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     font.size.variable.x-cyrillic: 17
     font.size.variable.x-unicode: 17
     font.size.variable.x-western: 18
     gfx.crash-guard.glcontext.appVersion: 45.2.0
     gfx.crash-guard.glcontext.deviceID: 0x6779
     gfx.crash-guard.glcontext.driverVersion: 13.301.1001.0
     gfx.crash-guard.glcontext.gfx.driver-init.direct3d11-angle: true
     gfx.crash-guard.glcontext.gfx.driver-init.webgl-angle: true
     gfx.crash-guard.glcontext.gfx.driver-init.webgl-angle-force-d3d11: false
     gfx.crash-guard.glcontext.gfx.driver-init.webgl-angle-force-warp: false
     gfx.crash-guard.glcontext.gfx.driver-init.webgl-angle-try-d3d11: true
     gfx.crash-guard.status.glcontext: 2
     gfx.direct3d.last_used_feature_level_idx: 0
     mail.openMessageBehavior.version: 1
     mail.winsearch.firstRunDone: true
     mailnews.database.global.datastore.id: 66044df6-8f4a-46a2-9b38-18e60c74944
     mailnews.database.global.views.conversation.columns: {"threadCol":{"visible":true,"ordinal":"1"},"flaggedCol":{"visible":true,"ordinal":"33"},"attachmentCol":{"visible":fals…
     mailnews.database.global.views.global.columns: {"threadCol":{"visible":true,"ordinal":"1"},"flaggedCol":{"visible":true,"ordinal":"33"},"attachmentCol":{"visible":fals…
     network.cookie.prefsMigrated: true
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     places.database.lastMaintenance: 1470709562
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     plugin.importedState: true

I am guessing you have had those settings for years. Port 25 is not going to work any longer unless you have a mail server. change it to 587

Update the server name in all instances to mail.twc.com both for incoming and outgoing mail

TWC provide these settings here http://www.timewarnercable.com/en/support/faqs/faqs-internet/e-mailacco/incoming-outgoing-server-addresses.html

What is available to me is my server setting are pop-server.san.rr.com. and the outgoing server = smtp-server.san.rr.com.

These are exactly the same server setting as my wife's computer and account and her email works fine. I changed mine to pop-server.mail.twc.com but nothing got better. I put it back. Then I got out my old laptop with the exact same settings in it. It immediately downloaded 50 emails from the last 3 days. The problem is peculiar to my personal computer, or at least its URL. The new modem TWC sent me was the wrong one and I will install another one they are sending tomorrow. Be back with an update.

what is the same about mail.twc.com and pop-server.mail.twc.com. That server you specified probably does not even exist.

It is mail.twc.com.

Did I mention I don't know what I am doing? If I ask my Thunderbird what its server setting are, it says pop-server.san.rr.com and smtp-server.san.rr.com. And that used to work and they still work on my wife's computer and on my laptop. It was suggested my Avast protection may have begun filtering the ports I was or am using and I need to set both ports to 587 and then check my firewall.

john.leek said

Did I mention I don't know what I am doing?

So why are you arguing about the settings, it is also obvious you have asked the same question in multiple places to make sure your information exceeds your ability to process what you are being told. Which adviser do you take notice of? which to ignore? or pick the one that says thing like you want to hear?

If I ask my Thunderbird what its server setting are, it says pop-server.san.rr.com and smtp-server.san.rr.com.

Not in the least relevant. When your local county advise you that your house is 123 elm St, do you ask the postman what the address is? Thunderbird is the postman in this story.

But a look at the database Thunderbird uses shows any person setting up an account now will not get those servers. https://autoconfig.thunderbird.net/v1.1/rr.com The database has been updated to reflect the settings provided by TWC for Road Runner accounts

And that used to work and they still work on my wife's computer and on my laptop.

Regardless of anything else, you are not having a working email client. Your settings are wrong as advised by your mail provider. The first thing to do is set those settings to whatever your mail providers says you should use. To do otherwise is like hanging the numbers 765 on the front of your house and complaining the postman does not deliver mail.

Your wife's setting probably need changing as well, one day they will just stop working when someone at your provider turns of a redirect or a server.

It was suggested my Avast protection may have begun filtering the ports I was or am using and I need to set both ports to 587 and then check my firewall.

Quit possible but you have not got that far yet. You are still at the point of opening the box and looking for the plug to plug it into the wall.

Just a little pointer. Port 587 is an incoming port and used for the pop mail protocol, it will not work on an outgoing serve. So anyone suggesting you use it for outgoing mail know less than you do probably.

Fix the settings is the first priority, not use "what Thunderbird thinks", or what some person on a forum somewhere said Use the settings provided by the only one to know what they set their server to use. Your mail provider.

If with the correct setting it still does not work. Then you look at why and that very probably will involve Avast messing up the process.

Once you have correct settings the recommended approach is as follows, but there is no point trying to fix ports or anti virus if the underlying settings are wrong.

• Restart Thunderbird with add-ons disabled (Thunderbird Safe Mode). On the Help menu, click on "Restart with Add-ons Disabled". If Thunderbird works like normal, there is an Add-on or Theme interfering with normal operations. You will need to re-enable add-ons one at a time until you locate the offender.
• Restart the operating system in safe mode with Networking. This loads only the very basics needed to start your computer while enabling an Internet connection. Click on your operating system for instructions on how to start in safe mode: Windows 10, Windows 8, Windows 7, Windows Vista, Windows XP, OSX

If safe mode for the operating system fixes the issue, there's other software in your computer that's causing problems. Possibilities include but not limited to: AV scanning, virus/malware, background downloads such as program updates.

I tried to ask Avast what my firewall setup was. Instead it told me it was off, then it was on again and wanted to reboot. So I let it restart the computer. All fixed.

  You showed me a lot of good information and I appreciate it.  Very interesting lines of inquiry.