[syslog-ng] write() failed (errno 32)

Hi, I have following lines in syslog-ng.conf filter aaa { match ("aaa"); }; destination aaa { program ("/usr/bin/mail -s WARN user"); }; log { source(src); filter (aaa); destination(aaa); }; When I run logger: # logger aaaIIII in messages file I have: Apr 5 13:06:26 src@host syslog-ng[1627]: io.c: do_write: write() failed (errno 32), Broken pipe What does it mean ? It happen from time to time, not always. przemol