E-mail attached file report file names renamed to unkown

Support User
1

We are trying to use tryton client do send pdf quotations to custumers from tryton sale view.
Mails are sent but in the received email the attached quotation report file name is renamed as unkown and other attached file is also renamed to unkown with no extention

Thanks for your help

2

It is strange because the attachments are added with the header Content-Disposition set with the filename.
Could you provide the raw content of the email?

3

I made other tests and I realised that the attached file name is utf-8 based.
In some webmails, it’s not correctly rendred. but if sent to gmail there is no problem with the file name.

I viewed the mail with Thunderbird without any issue.
Maybe utf-8 based file name is not supported some mail client