Wishlist: icon with envelope and tiny seal

[sergiocallegari]

Hi, I think it would be useful if you could provide a variant of the "envelope" icons, with a little seal on the bottom right corner, where there are often other small elements like a "!", an "@", a tick, etc.

This is because in some countries, notably Italy, there is a form of "registered" email, that can be used for all the uses where registered paper mail would suit. The general accepted symbol for it is that of a small seal.

Something like this https://raw.githubusercontent.com/Templarian/MaterialDesign/2424e748e0cc63ab7b9c095a099b9fe239b737c0/svg/email-seal-outline.svg would be great to have.