Diễn đàn hỗ trợ Thunderbird

get this message every time I try to send an email:

Sending of the message failed. An error occurred while sending mail. The mail server responded: [VO-1] Message blocked due to spam content in the message.. Please check the message and try again.

I attempted all troubleshooting through the website to no avail.

Mail Provider - Penn Tele Data - Mozilla Firebird ISP - Blueridge Firewall - Windows Defender Anti-Virus - none OS- Windows 10 Thunderbird - version 128.4.4esr

Windows 11 128.4.3 (64 bit)

When I used to empty Junk (and compact) & Trash, I would then File / Compact Folders that would show how much space I was saving - I do not see how much space I am saving now for the past couple of months.

Did a Setting get changed ???

Calendar data is correct in preview, but incorrect when editing

The dates in the preview (when I move the mouse over the calendar entry) are always correct. However, they differ from the entry when I click on Edit.

But it works for me when I delete cache.sqlite. However, I then delete the newer entry (which is displayed correctly in the preview).

Any ideas? Where does the preview data come from? Obviously from a different source than the data displayed in the edit view?

For a short while now all my received emails have extended line spacing resulting in excessive white space. I've not knowingly done anything to cause this. Is this something I can put right and how do I go about it?