Unfortunately neither the guidelines, the template nor this instruction covers how may I do it in the llncs documentclass.
Of course I can provide e-mail with my affiliation, but there are other authors from my institute. Also I may claim that there is a Corresponding author: email@example.com institute and (despite of an evident violation of the semantics) I would go that way the affiliations were not automatically enumerated. I believe the corresponding author should be indicated more clearly than the biggest superscript number.
\thanks macro also is not what I expect as it results in a footnote, not a part of the title.