Not compatible with net-smtp 0.4+

[bak1an]

The way of adding auth methods changed in ruby/net-smtp#53

[bak1an]

@macks Would you be interested in a PR for resolving this?

[Wolfer]

I maked new one gem that use some code this gem, but support net-smtp > 0.4

https://rubygems.org/gems/net-smtp-ntlm

[bak1an]

https://github.com/bak1an/net-smtp-auth_ntlm

Made rubyntlm wrapper for smtp. Does not require any openssl tricks.