Suddenly can't send email from main account or change SMTP provider


I frequently use this laptop at two different locations. The ISP (Suddenlink) at one of the locations only wants me to use their outgoing SMTP server, so I changed my email accounts a couple of years ago to make that the default outgoing server. A few days ago, I started getting the following message and have been prevented from sending outgoing mail:

"An error occurred sending mail: The mail server sent an incorrect greeting: connection refused from []."

I changed the outgoing mail server to the ISP at my main location to the local provider (Comcast) and I can send mail through that provider from all accounts except my main account (account 1). Account 1 shows Comcast as the outgoing server in the settings window, but the error message and the Troubleshooting window continue to show Suddenlink as the outgoing SMTP server, even after multiple attempts to change it.

Any ideas on what to do?

Thank you very much,


Application Basics

Name: Thunderbird
Version: 17.0
User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/17.0 Thunderbird/17.0
Profile Folder: Show Folder

(Local drive)
Application Build ID: 20121116131442
Enabled Plugins: about:plugins
Build Configuration: about:buildconfig
Crash Reports: about:crashes
Memory Use: about:memory

Mail and News Accounts
INCOMING: account1, , (imap), SSL, passwordCleartext
OUTGOING:, plain, passwordCleartext, true

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

INCOMING: account3, , (pop3), alwaysSTARTTLS, passwordCleartext
OUTGOING:, plain, none, true

INCOMING: account4, , (pop3), alwaysSTARTTLS, NTLM
OUTGOING:, plain, none, true

INCOMING: account5, , (pop3), alwaysSTARTTLS, passwordCleartext
OUTGOING:, alwaysSTARTTLS, passwordCleartext, true

INCOMING: account6, , (pop3), plain, passwordCleartext
OUTGOING:, alwaysSTARTTLS, passwordCleartext, true

Silvermel and Charamel XT, 1.5.4, true,
Test Pilot for Thunderbird, 1.3.9, true,

Important Modified Preferences

Name: Value

browser.cache.disk.capacity: 1048576
browser.cache.disk.smart_size.first_run: false
browser.cache.disk.smart_size_cached_value: 1048576
extensions.lastAppVersion: 17.0 Consolas Consolas Consolas Consolas Consolas Consolas Consolas Calibri Calibri Calibri Calibri Calibri Calibri Calibri Cambria Cambria Cambria Cambria Cambria Cambria Cambria
font.size.fixed.el: 14 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 17
font.size.variable.x-baltic: 17
font.size.variable.x-central-euro: 17
font.size.variable.x-cyrillic: 17
font.size.variable.x-unicode: 17
font.size.variable.x-western: 17
mail.openMessageBehavior.version: 1
mail.winsearch.firstRunDone: true eb7173b9-b273-4d46-a04f-62408fe9dd5
network.cookie.prefsMigrated: true
places.database.lastMaintenance: 1357006482
places.history.expiration.transient_current_max_pages: 104858
plugins.update.notifyUser: true


Adapter Description: Intel(R) HD Graphics Family
Vendor ID: 8086
Device ID: 0116
Adapter RAM: Unknown
Adapter Drivers: igdumd64 igd10umd64 igd10umd64 igdumdx32 igd10umd32 igd10umd32
Driver Version:
Driver Date: 11-12-2010
Direct2D Enabled: false
DirectWrite Enabled: false (6.1.7601.17789)
ClearType Parameters: ClearType parameters not found
WebGL Renderer: Google Inc. -- ANGLE (Intel(R) HD Graphics Family) -- OpenGL ES 2.0 (ANGLE
GPU Accelerated Windows: 0/1
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