This is a temporary release of
[`lettre`](https://crates.io/crates/lettre) to resolve [issue
#312](https://github.com/lettre/lettre/issues/312) which [prevents
compiling with OpenSSL
1.1.1](https://github.com/sfackler/rust-openssl/issues/994). Once that
issue is resolved, this crate will be yanked and you should switch back
to lettre.