Most spammers are lazy. They will not bother to spoof the from email address. First step is to check it and if it's not apple.com it is certainly spam. If it is, you still need to be careful, following steps as suggested by andytug above.
Currently my spam is almost exclusivly from FedEx and Google. Mostly with hidden links to cheap and phony drug sites. Perhaps also contains malware. I now have my default setting to not open images.