When attempting to send mail in Thunderbird, I am getting a very long string of gibberish (code?) How do I get rid of this irritation? Thanks

Please describe your problem in better detail.

- What is your operating system?

- What version of Thunderbird?

- Who is your email provider?

- What error messages do you see, if any? Please quote precisely and in full. A screen shot might be helpful.

- Where, specifically do you you see this "string of gibberish? A screen shot would be helpful.

- Does this happen before or after you press the Send button?

Please describe your problem in better detail.

- What is your operating system? Windows 11

- What version of Thunderbird? 153.6.0esr (64-bit)

- Who is your email provider? Bell Canada

- What error messages do you see, if any? Please quote precisely and in full. A screen shot might be helpful. No error message but what I see is a very long string that looks like this -- PK!ߤ�lZ
[Content_Types].xml �(����n�0E�����Ub袪*�>�-R�{V��Ǽ��QU
� l"%3��3Vƃ�ښl �w%�=���^i7+���-d&�0�A�6�l4��L6
0#�Ò�S O����X��*��V$z�3��3������%p)O�^����5}nH"d�s�Xg�L�`���|�ԟ�|�P�rۃs��?�PW��tt4Q+��"�wa���|T\y���,N���U�%���-D/
��ܚ��X�ݞ�(��
�<e��)��;�n�l?�f�˼��܉��<fk� �h�y����ڜ���q�
i��?�ޯl��i�1��]�h�g��m�@����m���pk!���n_rels .rels �(����j�0 @���ѽq���n c���[il��j���<��]�ag��ӓ�zs�fu��]��u �� ��^�[��x����1x�p� ���f��#i)ʃ�y���������*d��i")��c$���qu���~3��1��jh[{�="E����~" f?��3-���޲]�tꓸ2�j)�,l0 %��b� < p></e��)��;�n�l?�f�˼��܉��<fk�>

- Where, specifically do you you see this "string of gibberish? A screen shot would be helpful. If attempting to write an email it is at the top of the body

- Does this happen before or after you press the Send button?

That looks to me like what you will see if you try to open a binary (data or program) file with a text editor. And the "PK!ߤ�lZ
> bit at the beginning suggests a compressed ZIP file.

Are you using a signature file, especially one with an image in it?

Are you basing this message on a template that may have a binary attachment?