Thunderbird Community Forum

Thunderbird is not connecting with Xfinity Comcast for sending or receiving emails at gpenkala@comcast.net . This combination was working fine for decades. Last Friday (Jun 12) was the last email I received in Thunderbird. I can view current emails on the Xfinity website, but these are not being transferred to my Thunderbird account anymore, These are the error messages:

"Sending of the message failed.

Unable to authenticate to Outgoing server (SMTP) smtp.comcast.net. Please check the password and verify the 'Authentication method' in 'Account Settings | Outgoing server (SMTP)'." "Sending of the message failed. An error occurred while sending mail: Outgoing server (SMTP) error. The server responded: resomta-c2p-555483.sys.comcast.net resomta-c2p-555483.sys.comcast.net Excessive failed authentication, ESMTP server temporarily not available."

Can you tell me what configurations I should be using within Thunderbird for Incoming and Outgoing Servers?

Hi, Since approx. 1 month, I cannot receive nor send emails from my Windows 11 desktop computer. My ISP is Videotron and they tell me that from their end, everything is fine and the configuration is fine. If I use the Videotron Web Service, I can send and receive emails using the Videotron Web Services but these are not reflected on my Thunderbird email interface. If I try to send an email from Thinderbird, I get this message # # * * Sending of the message failed.

1. # * * An error occurred while sending mail: Outgoing server (SMTP) error. The server responded: smtp.videotron.ca Videotron ZGdcwFfPIz2we service temporarily unavailable AUP#EML-016.'

On my Android smartphone, Thunderbird is installed and it works perfectly...I can send and receive emails.

What can be done to make sure that I can send and receive emails from my computer, and to keep the smartphone and computer synchronized. Thank you

All of a sudden every time I open something in an email it automatically creates a new tab. When I delete what I have open it takes me out of my email account and I have to delete the tab to get back to my remaining emails. I have changed nothing so I am confused as to why it has recently changed.

the default font for writing texts is too small for me to easily read. Yet when I send the message the text size too large, How do I control these font sizes independently

Hello, I have six calendars: five are hosted by one provider, Runbox.com, via SabreDAV, and one is hosted by a different provider, Apple iCloud Calendar. I am periodically seeing the error shown below on multiple calendars during automatic sync.

I have saved a two-day event history from the error console and can provide it on request, along with any other troubleshooting information that may be helpful.

I am technical by nature, but my programming experience was primarily with mainframes rather than personal computers. Could someone kindly help me troubleshoot this ongoing issue?

Thanks in advance.

Bill

10:34:53.958 An error occurred when writing to the calendar House! Please see below for more information. Error code: MODIFICATION_FAILED. Description: If you’re seeing this message after snoozing or dismissing a reminder and this is for a calendar you do not want to add or edit events for, you can mark this calendar as read-only to avoid such experience in future. To do so, get to the calendar properties by right-clicking on this calendar in the list in the calendar or task view. CalCalendarManager.sys.mjs:949:15

   announceError resource:///modules/CalCalendarManager.sys.mjs:949
   onError resource:///modules/CalCalendarManager.sys.mjs:803
   notify resource:///modules/calendar/utils/calDataUtils.sys.mjs:46
   notify resource:///modules/calendar/utils/calDataUtils.sys.mjs:73
   onError resource:///modules/CalCachedCalendar.sys.mjs:95
   notify resource:///modules/calendar/utils/calDataUtils.sys.mjs:46
   notify resource:///modules/calendar/utils/calDataUtils.sys.mjs:73
   notifyError resource:///modules/calendar/utils/calProviderUtils.sys.mjs:689
   notifyOperationComplete resource:///modules/calendar/utils/calProviderUtils.sys.mjs:662
   notifyListener resource:///modules/CalDavCalendar.sys.mjs:720
   doModifyItem resource:///modules/CalDavCalendar.sys.mjs:794

Here is an additional group of errors from the night before:

23:09:52.245 [calCachedCalendar] replay action failed: <unknown>, uri=https://dav.runbox.com/calendars/908506/bill/, result=2147500037, operation=[xpconnect wrapped calIOperation] 23:09:52.249 calendar: CalDAV: No response status doing webdav sync for calendar House CalDavRequestHandlers.sys.mjs:476:16 23:09:52.249 calendar: CalDAV: No response status doing webdav sync for calendar House CalDavRequestHandlers.sys.mjs:495:16 23:09:52.249 calendar: CalDAV: Error doing webdav sync: undefined CalDavRequestHandlers.sys.mjs:528:16 23:09:52.263 calendar: There has been an error reading data for calendar: House. However, this error is believed to be minor, so the program will attempt to continue. Error code: DAV_REPORT_ERROR. Description: There has been an error reading data for calendar: https://p31-caldav.icloud.com/204954917/calendars/home/. It has been disabled until it is safe to use it. CalCalendarManager.sys.mjs:952:16 23:09:52.263 calendar: There has been an error reading data for calendar: House. However, this error is believed to be minor, so the program will attempt to continue. Error code: READ_FAILED. Description: CalCalendarManager.sys.mjs:952:16 23:09:52.263 [calCachedCalendar] replay action failed: <unknown>, uri=https://p31-caldav.icloud.com/204954917/calendars/home/, result=2147500037, operation=[xpconnect wrapped calIOperation]

I have just been updated to a fibre BT account. My Thunderbird e. mail now refuses to let me send out e. mails, though it receives them correctly. It rejects all recipients. I have checked the outgoing server and the settings are correct. This problem is specific to one computer here, others don't have any problems. Despite refusing to send e. mails, my e.mail service provider, Greenby, has received mail from me this morning which is said to be unsent. What is blocking the server?

somehow i managed to import from one email account to another thinking i would like it but i don't like since it just makes me have same mail in 2 places but i don't know and can't find how to cancel the import, can someone tell me how

Hi , I am using the MacBook Pro M5 which is running with macOS Tahoe 26.5 . I have installed Thunderbird mail with version 150.0.2 . After the initial installation with only one account with few mails in the inbox I found the App opening time is abnormally high & is more than 1 minutes . I have removed the mail App few times & re installed it ( even I have re download the app from net again) , but the problem remain same .

I have removed the old folder & files from - ~/Library/Thunderbird/ , ~/Library/Application Support/Thunderbird/ , ~/Library/Caches/Thunderbird/ , org.mozilla.thunderbird from ~/Library/Preferences/. before the re installation & re started the laptop , but no improvement in results .

Also in mail setting references → Unchecked the option - Enable Global Search and Indexer Disable all Extensions and Themes under Tools → Add‑ons & Themes (No Extensions is installed) .

Just to inform that the apple mail is working fine in this laptop .

After all the above trails the results are same , the app once quit & re start - it takes around 1.5 minutes to open after which the app works normally with out any problem . Please suggest if any solution is available for this problem . Best Regards Gautam Banerjee

Exported ical file from Google Calendar and then went to import into Thunderbird. This previously worked in the same installation. The import failed and the error console displayed the attached message. Restarted Thunderbird. Calendar showed ready and is not read only. Same problem.

AEC=AaJma5sZfYpUynazK8VyE33lRH_bhYfkgyNbT-jfeMG8oD9uyOL3N1Tosw; SID=g.a000-QjMRUuc5NGRZnfIyV62s51uwP092-cAZ8l-W1NxM_OQOZgN1ZGKY_k3Vm6pREDoCBlyZQACgYKAaoSARYSFQHGX2MihkApsKYUVI5U0lvA4IprdhoVAUF8yKocew6am1Lja7MZNJXjVFfV0076; __Secure-1PSID=g.a000-QjMRUuc5NGRZnfIyV62s51uwP092-cAZ8l-W1NxM_OQOZgNPX43hncLJhc0c9GgSYkIaAACgYKAagSARYSFQHGX2MiVuCDvu0O95tPcINGtjsK7xoVAUF8yKqfLIxmqPmELGT_sSxLVwES0076; __Secure-3PSID=g.a000-QjMRUuc5NGRZnfIyV62s51uwP092-cAZ8l-W1NxM_OQOZgNNMUIukZ_cC2aRovR8uD_nQACgYKAQISARYSFQHGX2MiNUm2DNMQYx7VzA1S7UKv0xoVAUF8yKrpSTr_QSJneKhFKn1_w5Fs0076; HSID=Ag17wXgwvE7Vb8FCF; SSID=AlWkvkyqhqjIiu1VT; APISID=qnZLeke_X102EccX/AC5i1OLEtI7XRX3m8; SAPISID=Fvek7Cs2FrTJzyKK/AZ8hkvbenGtCp9Y6_; __Secure-1PAPISID=Fvek7Cs2FrTJzyKK/AZ8hkvbenGtCp9Y6_; __Secure-3PAPISID=Fvek7Cs2FrTJzyKK/AZ8hkvbenGtCp9Y6_; SEARCH_SAMESITE=CgQI-KAB; GOOGLE_ABUSE_EXEMPTION=ID=34426013174f2835:TM=1779949443:C=R:IP=102.91.93.202-:S=ag90j64rusEUCvspsBs_DR4; NID=531=U-dqNSefPCar8BG-3VTiDHvjxeLCRw7n8Xz3kwz3LCUWSX-yZWf9gg1xp9jn-gw_ns9_78OlgXm_IWFRe6gyh3wSfvEaMOR7wlgNAIJ9xuhhpu46nxgHHf5h3DzmXq15tDqzM7vTF8A5hHJbrDBma-vHxEER2rDKA7YcaGl3PTFdleMMjWGvrLV9uMlZa-omAqt2HiWJfZa_nvnKbiFa8Gg01H5aB2GlDQ8GOvAlg6A3pPGlaJmymQ9qOJ5QwcCnW6SA1BtT1DSH1647PneJQ_c_Z7FswC1g0oSEFsZvfwSYdHWn8MfcVAPEDx5upHA1u6IXV-Xi7OwQ3BVMlXHV8PdawxY0Ffufc5oDhLEju76Dr8EXnPeKTwW44oUONQpUORha2nHoowmLYUCKr88-gyC9BlZlwPc8pn_5Bxph2hLv93ToFXuZP1BzaJsAJWbTS_ZrhxOkCRUMHdzRr999wMGYyxIGlOfDtyzVlqVIa1yRD9X1sGKGlKgqqR_8X1gdfkWESSNRo1gNaLNGz4osDv7nXE6m3T0hA658b_CoOsT5q7bGhFGCL6Cz54usoc0abIr7Zu36Hnibn6JzzyK1MS89q36RFTju-9azQUePGvwPKkLNqizS_LF3nrGUMQkHOlUOt5uzcNaWiNqBUBtqpiKRHzzSN-sZQ11yhYGqmmPPOmKDg-Tq8cojdQxxV8aJpY3ZBnF2s1dz_h_HPcbNaHTG; __Secure-STRP=ANmZwa2zc98VItEzdq3ZrrHTEKOdkuRqpeOFs415dJ1HmQPbgLQqkK4je3pQ5X_h88vu1zqBZ6JpV8o1FSNtOUI7_3EgUYyfig; DV=w9sfrGGovEprEAC_7T8lkz2UlBXU5hmI-LVhLnx59gAAACAcuD9TMkTrQAAJhcTY7CRtr7FgAAAEYRqzsH9CszBwAAACKOl0gFWplGAwAAAA; SIDCC=AKEyXzVdkNe0enUIiIlyxu5o3IuFjqdSLtU8Q0TYi-ouaQ2Cj1Vtlb6ncct-tB4nNa-Oizfh; __Secure-1PSIDCC=AKEyXzU3gOn6_YS7E7O7IYRSmx3WOsH3-6C2qHXqwXGdZ76qWT7lpcQ-6vVXDfLjHmGcUEArVw; __Secure-3PSIDCC=AKEyXzXrbE797aBJFty1GVZVT3zRqplkmkT6hq5VXv3nIxwjablaMWaHMZy70n2otklzMvcC

I get your begging for money, you are obviously young, I have donated more money to you already than all my other email providers combined, period, you will allow me to move , remove as much as I want or I can delete you and you lose any future donations, but ticking me off with this we think this is junk crap trying to get more money from me only makes me want to DELETE YOU YOUNG PEOPLE, you act just like your buddy Google, lmk Anthony, or stop the bs

- Linux ver 140.7.1esr (64 bit) my folders are now out of alphabetic order among other things Trash us now under 'T' instead of grouped near the sent folder and my Computer folder has a mind of it's own. It's not under C even after I changed the name. It is just stuck. Wha? tnx