Read what the experts say:
According to the anti-spam experts, we are seeing far more spam mails now than ever before. And the spammers are becoming more clever about getting past the spam filters. That’s why more spam is making it to the Inbox instead of going straight to the Bulk/Spam folder, and why some of your good mails are ending up in the Bulk/Spam folder. There are a few basic things we can all do to keep spam to a minimum…
1. Spam mails that go straight to the Bulk/Spam folder should be left there, unopened. You can empty that folder any time you want, but never NEVER open spam mails. DON’T try to unsubscribe from anything and DON’T click any links in those mails.
2. Spam mails that land in your Inbox should be marked as Spam so that they are moved to the Bulk/Spam folder and their addresses placed on the Blocked list. (Blocking an address prevents mails from being received from that address in the future.)
3. Any email that you are the least bit suspicious about should be deleted immediately. Don’t let curiosity get the better of you. Simply opening a spam email out of curiosity alerts the spammers that you have an active email address to which they will send TONS of spam mail in the future. Open emails ONLY from those you know and trust.
References :