SMTP Send Email Attachment with Password

[Martin Obongita]

Hi @Everyone,
I am using the sample library smtp_ow3 to send emails. If I attach PDF file and click start button, it is sent, delivered and I can open the attachment. The challenge is if I attach a PDF file encrypted with a password, the file is delivered but I cannot open it. Neither does the PDF prompt for a password to open.
How do I set the attachment MimeList parameters for a password protected file attachment?-MimeType-Charset
-Encoding
RegardsMartin.