[exim] Maximum size of filter

Hi lists!

We have Exim 4.75 on our Server at work.
Some users have an autoresponder. To do this a filter was composed with fields
from the database.
Now, if the text of the autoresponder is too long, the filter exceeds the
maximum size of 1024 characters and Exim send an error...

Is it possibile to change this value? Or have I to find another way to have long
autoresponder-textes?

Thanks a lot!
Luca Bertoncello
(lucabert@???)