Digital technology advancement has made the work easier and faster over the years. Digitally signed invoices from Tally software falls under the same category. Creation of digitally signed invoices from Tally is now possible and the authenticity of the signature/invoice either valid or invalid can be known by selecting the digital certificate brought by your organisation from the license certificate authority (CA). 

This digitally signed invoices eliminate modifications during transit, in case there are any such modifications done on the signed invoice during transit then the signature will get invalid. Creation and mailing of digitally signed invoice eliminates the chance of modifications and builds trust.