pie@butter phpbb % grep -r '[eE]'-mail phpBB/language|wc
144 3378 27327
pie@butter phpbb % grep -r '[eE]'mail phpBB/language|wc
24 943 7174
However, on google "email" has 5.85 billion results to only 2.98 billion results for "e-mail".
Should probably also be added to the section in http://area51.phpbb.com/docs/30x/coding-guidelines.html#namingvars which defines smiley as the correct spelling.
Currently both spellings are valid, email is preferred by RFCs and probably the way of the future.
Personally I prefer without the dash. I agree that there should be consistency within the software.
CarolC1, you are describing a different bug entirely. Would you mind creating a new issue for it?