How to clear /var/spool/output/msglog folder

Can someone tell me is it safe to delete content of /var/spool/output/msglog folder?

Hard drive on clients SG135 (converted to XG v18.04) is full and because of that mails sre blocked:

console> system diagnostics show disk

Partition        Utilization(%)

===============================

configuration        10%

content               2%

report              100%

===============================

SG135_XN01_SFOS 18.0.4 MR-4# du -sh /var/spool/output/msglog

231.4G  /var/spool/output/msglog

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I have tried to delete reports from GUI (Report settings - manual purge) and from CLI (Advanced shell - purge reports) but it was helpful for a moment - it created about 20GB of free space but it was lost in two days. Disk was full again and previous steps was not helpful any more.

So, i have about 1400 files (each about 165MB size) that has occupied HDD and now XG is blocking sending and recieving mails.

Is it safe to delete those files with rm /var/spool/outout/msglog/* ?

Any idea? I am not running out of time ... i was two days ago so pls

Thanks in advance