Because online spam has become such a problem in the 21st century, there have been many steps taken in an attempt to block it. Of course nothing is fool-proof, in all reality a lot of spam is still able to get through while genuine e-mail messages are being blocked. There are several types of e-mails that are most commonly picked up by spam filters. If you know what these are then you can create your genuine, important e-mail messages in a manner that won’t cause it to be marked as spam. The top 10 types of e-mails that are accidently blocked by your anti spam filtering are:

#1: Using one of the free e-mail accounts may automatically mark you as spam on some filters.

#2: Forum sign-up confirmations messages, or other confirmation e-mails.

#3: Newsletters and other related e-mail messages.

#4: Discounts from online retailers with whom you do business.

#5: E-mails that have been sent out to multiple addresses at the same time.

#6: E-mails that are missing a subject line, or those with a subject line that is all in caps.

#7: Sending multiple e-mail messages to one address from several different e-mail accounts using the same Internet Protocol (IP) address.

#8: Failure to include an “unsubscribe” so that those who receive your e-mails can opt out if they choose to do so.

#9: Ignoring the responses of those on your mailing list may cause them to mark you as spam on their own.

#10: Deleting or otherwise changing your e-mail account after sending a message.