A letter or an email

[z]

Test No. incompl/elem-12 "We went on holiday", question 8

If you can't reach me at home, send me a ..........

(a) postscript
(b) email
(c) letter
(d) brief

Test No. incompl/elem-12 "We went on holiday", answer 8

If you can't reach me at home, send me a letter.

Correct answer: (c) letter

Your answer was: incorrect
If you can't reach me at home, send me a email.
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Why is not the answear email corect.

[Torsten]

The word email starts with a vowel (e) which means it requires the article an. So, it's a letter but an email.
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Test Of English for International Communication
TOEIC Preparation & TOEIC Vocabulary

[Guest]

[Torsten]

A postscript (P.S.) is additional text which you can add to a letter or email you have completed. So a postscript is an additional note a message.
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Test Of English for International Communication
TOEIC Preparation & TOEIC Vocabulary

[Guest]

you say that it is a letter but the site mentions that the correct answer is a brief