Strange behavior after ZCS migration from 32 to 64 bit system

[sereose]

Hello everyone,
I have performed a migration ZCS server form 32 to 64 bit to the same version 5.0.20_GA_3127 OpenSuse 10.2 (32 bit)
to RedHat Enterprasie Linux 5 5.0.20_GA_3127.RHEL5_64_20091102122116 RHEL5_64 FOSS edition
Everything was fine.
But after a while users start reporting than some strange symbols are adding to the email content from time to time.
After investigation I noticed if the user is using signature and it's contains
none english symbols (in my case it's in a French language ) in it the email will be attached with some unknown digital symbol at the bottom of the email .
Please see attached pictures.
If someone faced with this problem please help.