[TYPO3] direct_mail problem - adresses can't be seen or dowloaded

[christian oettinger]

Hi all,


I have a problem in my older typo3-installation (3.7.1) with direct_mail 
1.1.0:
Until 16.000 Adresses or so it was all beautiful. But now (around 
20.000) I can not see the adresses (all in one group) in newsletter 
module,   neither can I download a csv-file, what my cutomer wants to 
do. I got a server-side error:

"Fatal error: Allowed memory size of 41943040 bytes exhausted (tried to 
allocate 98 bytes) in 
/homepages/24/d124225771/htdocs/typo3/t3lib/class.t3lib_div.php on line 
1451"

I understand why this happens.
But does anyone perhaps know a fix?

thanks!

oe (christian)