I have tried to increase the Maximum message size (kb):* from the Admin GUI. But the maxmimum size is not changing.

What ever the size I change to from either 10000kb to 20000kb or from 10000kb to 7000kb, when I press SAVE, it is going to its default size 10000kb.

I would like to increase the maximum mail size as many of my users receive such emails with attachments. Please reply me on how to do this.

Many thanks