I hope this Addon help and solve your issue

• https://addons.thunderbird.net/en-US/thunderbird/addon/dafizilla-table2clipboard/

For more about thunderbird Tables

• https://support.mozilla.org/en-US/kb/tables-format-messages-rows-and-columns

Hello iamjaya. Thanks for helping but this addon is not compatible with last versions of thunderbird. Obviously need too old version

It is always a pain when trying to copy paste anything from another program eg: MSWord, MSExcel etc because those programs are specifically designed to produce specialised results. This means they have a load of code which does not necssarilly translate into emails that use html. When you copy paste you are copying a load of html css code some which will be microsoft specific and cannot be rendered exactly in non microsoft products. If recipient reads using Plain text, it removes all the formatting anyway and makes the email look a mess if someone copy pasted a table.

Therefore, it is always advisable to attach files rather than copy paste the content because then the recipient can open the files in a suitable program and see the files exactly as they are intended to be seen. They can also copy the file or detach from email and save it.

Tables are best created in Thunderbird using the Formatting Bar, then there is more control over how it appears.

Alternative, if the table in excel is not something the recipient needs to alter, then you could take a screendump image of the excel table, save as eg: .jpg image and then insert image into email.

Just a thought....in Excel, have you actually set the table to have borders around table and cells ? Excel normally just shows the cells because the program is designed automatically to do that, but this does not mean they have been formatted to have borders of any size which allow you to copy html code over to an email so the borders can be rendered. Worth checking.