add a filter for only parsing email from a specific sender
add a filter for only parsing email from a specific sender

Sometimes we'll need to import only email from a specific
(broken?) sender, so let's add a quick filter for this.

Humbedooh/ponymail,quenda/ponymail,Humbedooh/ponymail,jimjag/ponymail,jimjag/ponymail,jimjag/ponymail,quenda/ponymail,quenda/ponymail,jimjag/ponymail,Humbedooh/ponymail