umask and mode of files created by mhonarc rw-------

I am not really sure why, but it appears that the file created by mhonarc
(called by procmail) are created with rw-------

I thought first that this was procmail fault... but it is not. Putting 
UMASK=022 in procmail result in spool file with mode:
-rw-r--r-x

but still the file created with mhonarc are rw-------

I tried to insert a umask 022; at the beginning of mhonarc ($VERSION =
"2.1.0";) but it does not work either...

Thanks for any hints,

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