Correct capitalization of words beginning with "e-" (for "electronic")

There may be some exceptions, but in titles I would generally capitalise as E-Learning.

The first page of Google Books results:

• 6 x e-Learning
• 4 x E-Learning
• 0 x E-learning

This one page is a too small sample, but you can check a number of books and see how it has been used in various places.

If there's a clear accepted form for any given e- word, then use that. Otherwise, I think the key is to to pick a style and use it consistently.

Computer mediated messages are now written as emails. When the word begins a sentence, or appears in a title, there would appear to be no reason not to write it as Emails. It’s too soon to say whether the other e words will go the same way. Elearning might, but there are obvious problems with a word like eassessment, whether with e or E. In general, however, I’d say it would be wise to follow current orthographic conventions and use the upper case letter where it would normally be required, provided doing so does not create difficulty for the reader. So, assuming hyphenation, E-learning, E-assessment, E-reader and so on.

The Microsoft Manual of Style, 4th Edition (used for technical documentation) recommends avoiding e- forms of words, unless necessary. For example, it recommends using words message and mail instead of email--the context should make the medium clear.

When it is appropriate to use an e- word, it recommends to use a hyphen and to capitalize it like any other hyphenated word (exception: email is not hyphenated).

Examples

E-commerce is a very lucrative business model.

Do you like e-commerce?

How to Succeed at E-Commerce (title capitalization)

Watch out for non-native speakers

E- words are not easily translated and may be confusing to non-native English speakers. So if you are writing for a global audience, it's usually better to avoid e- words, even if it means using more words.