Plural or not (spam emails vs. email spam)

[Attila]

Hi All,

This is my sentence:

Spam mails are a great problem not only for us but all other companies in the world.

1. Is this OK or should I write Spam mails is a great problem ...
2. Can I omit the word for the second time or should I use it 2 times?
e.g. not only for us but for all other ...

Thanks,

[Mister Micawber]

.
'Spam mail is'
'Spam mails are'

Both seem acceptable these days. I'd keep the second 'for' for clarity.
.
_________________
Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mister Micawber

[Torsten]

Hi Attila, isn't it great to have friends like Mister Micawber and Amy? In addition to MM's suggestion you could also write 'email spam is a great problem'.

What do you think?

Thanks,
Torsten
_________________
Test Of English for International Communication
TOEIC Preparation & TOEIC Vocabulary

[Pond969]

Attila ... I would suggest 'Spam mail is' when referring to the phenomenon as a problem, but 'spam mails' when referring to a specific group of e-mails.

'Spam mail is the scourge of internet communication' vs. 'These spam mails (or e-mails) are driving me crazy today'