Spam blockers are very primative programs. They try to look for certain character strings that are often present in spam messages. However they are woefully flawed, and can often let spam through while capturing legitimate messages. It is always necessary to check your spam or junk mailbox from time to time to see if there are any legitimate messages there. For example, if you purchase something on line, or even join a list, anything where a confirmation message is generated, and you don't receive that message, check your junk or spam mailbox, and you'll probably find it there. I have even had cases where personal messages that I received in my inbox for years were all of a sudden flagged as spam, and began showing up in my junk mailbox. This situation can be partially remedied because spam or junkmail filters usually have something called a "Safe" list, or "White" list, in which you can enter the Email addresses of the senders of legitimate messages that end up being flagged as spam.
Andy
