resolve #806: forbid empty forward path when deserializing address::Envelop

[ilka-schulz]

solves #806

[paolobarbolini]

I also see the commit is associated to an email of a different GitHub account. What's up with that?

[ilka-schulz]

I also see the commit is associated to an email of a different GitHub account. What's up with that?

I was recently required to open a GitHub account for my self-employment because I wanted my startup to have an account on crates.io. Unfortunately, one can only log into crates.io with a GituHub account. I use this GitHub account (@ilka-schulz) for years now and I have no intentions to ever use the @is-labtech account for anything except logging into crates.io because my startup is on GitLab. However, I use lettre in a microtool at my startup, so the VM (I use Qubes OS) where I develop that microtool has my business email in the .gitconfig.