yesterday I made an upgrade to version 6.1.

As I use cronjobs for generating my sitemaps and activated the mail notification for the cronjobs, I usually get a short mail, whenever a sitemap is generated.

Since the upgrade I get very large mail notifications, including the whole sitemap (in html code) in the mail text (not as an attachment).
I didn't change anything about my cronjobs.

I always use this command:
/usr/bin/php /var/www/vhosts/xxx.de/httpdocs/generator/xxx.de/runcrawl.php

Got any Idea what might be wrong?

Thanx in advance.

Please try to use:
/usr/bin/php /var/www/vhosts/xxx.de/httpdocs/generator/xxx.de/runcrawl.php  >/dev/null 2>&1
If I use this code, I got no mail information from cron daemon. However, I still would like to receive error messages.

you can pipe the output with "tail" command to limit it:
/usr/bin/php /var/www/vhosts/xxx.de/httpdocs/generator/xxx.de/runcrawl.php | tail