MMSEncoder has no no Expiry Encoder

[ekahn27]

There is no method to encode the expiry header of an MMS

[mlee-eng]

I want to use this tool in my test setup. I've run into this issue. Has anyone coded this successfully?

[ekahn27]

Take a look at my pull request on the same topic. I think there was an issue with Travis when I made the pull request, but that code is currently being used internally at a large cyber security company.