it is not a file, it is something you copy and taste into a message on the forum. I suggest you paste at least the first half of it as it contains relevant account settings and antivirus products in use are shown. They by the way are the major source of mail receipt problems, not Thunderbird and not mail providers. Antivirus products

Thanks your reply. Below is part of trouble shooting information: Application Basics Name Thunderbird Version 149.0.2 Build ID 20260403233102 Distribution ID Update Channel release User Agent Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:149.0) Gecko/20100101 Thunderbird/149.0.2 OS Windows_NT 10.0 26200 Launcher Process Enabled Multiprocess Windows 0/0 Fission Windows 0/0 Enabled by default Remote Processes 1 Enterprise Policies Inactive Google Location Service Key Missing Google Safebrowsing Key Missing Mozilla Location Service Key Missing Safe Mode false Memory Size (RAM) 11.8 GB Disk Space Available 148 GB Mail and News Accounts ID Incoming server Outgoing servers Name Connection security Authentication method Name Connection security Authentication method Default? account1 (pop3) mail.comcast.net:995 SSL passwordCleartext smtp.comcast.net:465 SSL passwordCleartext true account2 (none) Local Folders 0 passwordCleartext account6 (imap) imap.comcast.net:993 SSL passwordCleartext smtp.comcast.net:465 SSL passwordCleartext true Libraries Library Status Expected minimum version Version in use Path RNP (OpenPGP) OK 0.18.1 0.18.1.MZLA.149.0.2.botan.3.8.1 C:\Program Files (x86)\Mozilla Thunderbird\rnp.dll OTR Failed to load. OTR chat encryption will not work. - - - Calendar Settings Home Name Value Name Type storage Disabled true Username URI Refresh Interval Read-only Suppress Alarms Cache Enabled iMIP Identity id1 iMIP Disabled iMIP Account Organizer Id Force Email Scheduling Popup Alarms Supported Alarms on Invitation Supported Max Alarms Per Event Attachment Supported Max Categories Privacy State Supported Priority Supported true Event Supported Task Supported Local Time Supported UTC/GMT Supported Auto-Scheduling Supported Crash Reports for the Last 3 Days Report ID Submitted Remote Processes Type Count GPU 1 Add-ons Name Type Version Enabled Location ID English United States Dictionary dictionary 2026.3.7 true app-profile @unitedstatesenglishdictionary Amazon.co.uk extension 1.1 true app-builtin amazon@search.mozilla.org Amazon.com extension 1.1 true app-builtin amazondotcom@search.mozilla.org Bing extension 1.0 true app-builtin bing@search.mozilla.org Chambers (UK) extension 1.0 true app-builtin chambers-en-GB@search.mozilla.org DuckDuckGo extension 1.0 true app-builtin ddg@search.mozilla.org Google extension 1.0 true app-builtin google@search.mozilla.org Wikipedia (en) extension 1.0 true app-builtin wikipedia@search.mozilla.org Language: 正體中文 (Traditional Chinese) locale 149.0.20260320.185705 true app-profile langpack-zh-TW@thunderbird.mozilla.org System theme — auto theme 1.4.2 true app-builtin default-theme@mozilla.org Dark theme 1.3.2 false app-builtin thunderbird-compact-dark@mozilla.org Light theme 1.3.2 false app-builtin thunderbird-compact-light@mozilla.org Security Software Type Name Antivirus Microsoft Defender Antivirus Antispyware Firewall Windows Firewall Legacy User Stylesheets Active false Stylesheets No stylesheets found

Thanks again.

Here is more of trouble shooting information: Important Modified Preferences browser.cache.disk.amount_written 668463 browser.cache.disk.capacity 1048576 browser.cache.disk.filesystem_reported 1 browser.display.background_color #c0c0c0 browser.display.use_document_fonts 0 browser.display.use_system_colors false browser.search.region US browser.theme.content-theme 0 browser.theme.dark-toolbar-theme true browser.theme.toolbar-theme 0 browser.zoom.full false doh-rollout.home-region US dom.storage.next_gen true dom.storage.next_gen_auto_enabled_by_cause1 true extensions.lastAppVersion 149.0.2 font.default.x-western serif font.internaluseonly.changed false font.minimum-size.x-western 14 font.name.monospace.x-western Cooper font.name.sans-serif.x-western Verdana font.name.serif.x-western Cooper font.size.variable.x-western 14 gfx.crash-guard.d3d11layers.appVersion 78.12.0 gfx.crash-guard.d3d11layers.deviceID 0x9bc8 gfx.crash-guard.d3d11layers.driverVersion 27.20.100.9415 gfx.crash-guard.d3d11layers.feature-d2d true gfx.crash-guard.d3d11layers.feature-d3d11 true gfx.crash-guard.status.d3d11layers 2 gfx.crash-guard.status.wmfvpxvideo 2 gfx.crash-guard.wmfvpxvideo.appVersion 91.12.0 gfx.crash-guard.wmfvpxvideo.deviceID 0x9bc8 gfx.crash-guard.wmfvpxvideo.driverVersion 30.0.101.1404 idle.lastDailyNotification 1776454959 layers.mlgpu.sanity-test-failed false media.gmp.storage.version.observed 1 media.hardware-video-decoding.failed false network.cookie.CHIPS.lastMigrateDatabase 2 network.cookie.cookieBehavior 1 network.dns.disableIPv6 true network.trr.blocklist_cleanup_done true places.database.lastMaintenance 1776037576 places.history.expiration.transient_current_max_pages 112348 privacy.bounceTrackingProtection.hasMigratedUserActivationData true privacy.clearOnShutdown.cache true privacy.clearOnShutdown.cookies true privacy.clearOnShutdown.downloads false privacy.clearOnShutdown.formdata false privacy.clearOnShutdown.history false privacy.clearOnShutdown.offlineApps true privacy.clearOnShutdown.sessions false privacy.clearOnShutdown.siteSettings false privacy.donottrackheader.enabled true privacy.purge_trackers.date_in_cookie_database 0 privacy.purge_trackers.last_purge 1776454959599 privacy.sanitize.sanitizeOnShutdown true privacy.sanitize.timeSpan 0 privacy.trackingprotection.allow_list.hasMigratedCategoryPrefs true security.disable_button.openCertManager false security.disable_button.openDeviceManager false security.osreauthenticator.blank_password true security.osreauthenticator.password_last_changed_hi 827345 security.osreauthenticator.password_last_changed_lo 1012108400 security.remote_settings.crlite_filters.checked 1628897798 security.remote_settings.intermediates.checked 1628897798 security.sandbox.content.tempDirSuffix {aeb9f08a-97d1-4324-9b13-968e63afe139} security.sandbox.plugin.tempDirSuffix {e31c99a6-97e0-4494-bee4-f57161bc5fbe} security.webauthn.show_ms_settings_link true signon.importedFromSqlite true storage.vacuum.last.content-prefs.sqlite 1776293309 storage.vacuum.last.index 2 storage.vacuum.last.places.sqlite 1775426634 ui.osk.debug.keyboardDisplayReason IKPOS: Touch screen not found. Important Locked Preferences fission.autostart.session true media.utility-process.enabled true Thanks again.