Comment 1 for bug 621133

Possible ways to solve this (feedback welcome):
 * include current zope user in lockfilename
 * include current path in lockfilename
 * include current mailserver in lockfilename (maybe you don't want to stress your mailserver with multiple projects sending the their newsletters the same time)
 * include a optional request parameter which you append in your clockserver-configuration to modify your lockfile dynamically.