On the question of e-mail vs email, there is some linguistic thought that can be brought to bear to further confuse the issue. The notion of an "initial based term" as the combination of two words is not new with E-mail (electronic mail).
Other similar terms include G-string, A-frame, A-bomb and H-bomb, L-shaped, O-ring, I-beam, T-bill, and U-joint to name a few. These are all having difficulty evolving into single words, and it is also interesting to note that the single letter has generally remained capitalized. That could be used to support E-mail as opposed to e-mail.
There is also a pronunciation issue as by standard rules, email should be pronounced with a soft 'e' as in 'ehmail', which also favors retaining the initial based form 'e-mail'. This thought can also be applied to some of the other vowel initial terms.
I have also read about objections to email because of the French word email, which I believe translates as enamel. I defer to our French speaking associates to shed more light on that situation and/or objection, if it really exists.
On the flip side, there is X-ray which has a similar identify crisis to its spelling and construction.
Good Luck
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