Why do some links in emails to forum topics trigger a forum login page whereas some lead straight to the logged in topic??
e.g. https://www.forum.puppylinux.com/viewtopic.php?t=4688&e=1&view=unread#unread leads to login - reply by bigpup
https://forum.puppylinux.com/viewtopic.php?t=4688&e=1&view=unread#unread opens logged in topic - reply by fredx181
difference is the www.
why are different links generated??