Tip: Use custom headers to expand rule options in Mail
While Mail has a built-in junk filter and also has support for third-party junk filters, there are times when certain spam will continually get by these filters. Usually when this happens you can create a special rule for the offending messages to automatically move them to the junk mail folder or trash, but sometimes junk mail may do a good job at hiding its origin. Despite this, you might be able to find a common feature among similar junk mail messages by looking at the message's extended header information, but then have no way to isolate it in a … Read more
