albi albinootje wrote:
>
> mm, i wasn't aware that postfix can possibly also block gif-attachments,
> thanks for the reminder

Not that I encourage blocking gif, but you can use header_checks. 
something like:

/^Content-Type:\s*image\/gif/           550 gif obsoleted here. use png.

should do. If spammers fake the type and MUAs tolerate that, you can use 
the "name=" attribute as well, but you'll also need the base64 and QP 
versions.

PS. converting gif to jpeg isn't always good. compressed jpeg is not 
appropriate for images that contain text such as cartoons, screenshots. 
In these case, png is a better choice. On the other hand, png and jpeg 
don't support animations, but who cares;-p



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