Sent emails arrive with extra gibberish making them unreadable

In BT Mail and Firefox , there is lots of gibberish arriving making the sent text unreadable, help please.
This is what I typed in the email I sent
“Roald Amundsen was a Norwegian explorer who led the first expedition to the South Pole in 1911 . He reached the North Pole in 1926”
Below is what arrived and shows in the sent tab
mso-fareast-font-family:"Times New Roman";mso-fareast-language:EN-GB">
mso-fareast-font-family:"Times New Roman";mso-fareast-language:EN-GB"> mso-fareast-font-family:"Times New Roman";mso-fareast-language:EN-GB">Roald Amundsen was a "Times New Roman";color:windowtext;mso-fareast-language:EN-GB;text-decoration:
none;text-underline:none">Norwegianmso-fareast-language:EN-GB"> mso-fareast-font-family:"Times New Roman";color:windowtext;mso-fareast-language:
EN-GB;text-decoration:none;text-underline:none">explorer"Times New Roman";mso-fareast-language:EN-GB"> who led the first "Times New Roman";color:windowtext;mso-fareast-language:EN-GB;text-decoration:
none;text-underline:none">expeditionmso-fareast-language:EN-GB"> to the "Times New Roman";color:windowtext;mso-fareast-language:EN-GB;text-decoration:
none;text-underline:none">South Polemso-fareast-language:EN-GB"> in 1911 . He reached the North Pole in 1926.

Basically it is because you have copied and pasted a Word document which contains hidden control characters.

Try using plain text e.g. from Notepad.

Alternatively use an email attachment of the Word Document.

Or setup your Email Account with a client like the Windows 10 Mail App.

E-mail created in word - BT Community
Email migrations - Update from BT - BT Community

I see you have asked on the BT forums as well.

My issue has been resolved by changing to plain from rich text when using Word Docs.