生産が遅れております。

Excite翻訳： Production is late.
@nifty翻訳： Production is behind.
Babel Fish： Production is late.
Google言語ツール： Production is delayed.
Yahoo!翻訳： Production is late.
OCN翻訳： Production is behind schedule.
Windows Liver Translator: Production is late.

Summary:
Google and OCN give natural expressions.
The most popular "Production is late" might be too direct in business correspondense.