node.js - Email or socket communication between servers -

I know this is a strange question but this is a group with which I am working and one is great debate I will try and explain what we are trying to do the best of our knowledge.

Actually we have multiple servers that are responsible for data processing. We need any kind of communication between them to pass data and possible orders, and a part of the group is interested in using some types of socket communication such as node.js or zeromuk and the email between the other group server One second wants to use email to communicate with.

So this question goes to any communication specialist or someone who can have an opinion on this matter. Which scalability, ease of deployment or just the best would be best suited for a better system design? Why do you think so? any other suggestions?

Thanks and any input is highly appreciated.

Although I agree with the suitability of this question, I do not imagine any scenario In which I like the email as a communication medium for a direct socket connection, or HTTP-based API. It may feel cold for it to work, but it is almost certainly a path to headache.