This is one question which comes up on a regular basis, should it be written e-mail or email?
Do you hyphenate or decide not to hyphenate?
Marketing or the managers should make a decision because it is a relatively new word and an abbreviated version of ‘electronic mail.’
The problem, no-one has decided which form is correct!
Web source grammar book asked the question and the comments make interesting reading – the question was posted in 2014 – to hyphen e-mail or not
English Oxford living dictionaries prefer email as you can see by clicking here to view: email (also e-mail) Noun
There will be a few which slip by because we adopt IoT and other technologies. That will prompt the same discussion as “is it e-mail or email?”
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