On 03.11.2016 04:45, vod vos wrote:

> HOW can we just receive just such as .jpg .png .mp4 and reject all
> other attachment in a short regexp to do the job?

That's not something that can be handled with a "short regexp".
I suggest you look into amavisd-new or other content filters
which work in combination with Postfix.

-Ralph

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