I cannot send emails anymore? I am receiving an error message about 5.7.1 Authentication required and it won't all me to send email messages. Please help. Application Basics Name Thunderbird Version 45.5.1 User Agent Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1 Profile Folder C:\Users\Wiley\AppData\Roaming\Thunderbird\Profiles\i5cbkrv6.default (Local drive) Application Build ID 20161130024037 Enabled Plugins about:plugins Build Configuration about:buildconfig Memory Use about:memory Mail and News Accounts ID Name Incoming server Outgoing servers Name Connection security Authentication method Identity Name Connection security Authentication method Default? account2 WDS (none) Local Folders None Normal password account3 Work Account (nntp) news.example.net:119 None Normal password Wiley Detail Services <brandonwiley82@yahoo.com> smtp.mail.yahoo.com:587 None Normal password true account4 Yahoo - BWiley (im) prpl-yahoo None 0 Crash Reports Report ID Submitted All Crash Reports Extensions Name Version Enabled ID Important Modified Preferences Name Value 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 45.5.1 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 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 gfx.blacklist.direct2d 3 mail.openMessageBehavior.version 1 mail.winsearch.firstRunDone true mailnews.database.global.datastore.id 2a81fdb4-86c0-4b07-b6ef-d4d5b355322 network.cookie.prefsMigrated true network.predictor.cleaned-up true places.database.lastMaintenance 1481145542 places.history.expiration.transient_current_max_pages 51884 plugin.importedState true security.default_personal_cert Select Automatically Graphics Adapter Description Mobile Intel(R) 45 Express Chipset Family (Microsoft Corporation - WDDM 1.1) Vendor ID 0x8086 Device ID 0x2a42 Adapter RAM Unknown Adapter Drivers igdumd64 igd10umd64 Driver Version 8.15.10.1749 Driver Date 5-6-2009 Direct2D Enabled Blocked for your graphics driver version. DirectWrite Enabled false (6.2.9200.17568) ClearType Parameters ClearType parameters not found WebGL Renderer Blocked for your graphics driver version. Try updating your graphics driver to version 8.15.10.2342 or newer. GPU Accelerated Windows 0. Blocked for your graphics driver version. Try updating your graphics driver to version 8.15.10.2342 or newer. AzureCanvasBackend skia AzureSkiaAccelerated 0 AzureFallbackCanvasBackend cairo AzureContentBackend cairo JavaScript Incremental GC 1 Accessibility Activated 0 Prevent Accessibility 0 Library Versions Expected minimum version Version in use NSPR 4.12 4.12 NSS 3.21.3 Basic ECC 3.21.3 Basic ECC NSS Util 3.21.3 3.21.3 NSS SSL 3.21.3 Basic ECC 3.21.3 Basic ECC NSS S/MIME 3.21.3 Basic ECC 3.21.3 Basic ECC