You have got your mailing list intact and email campaign ready to be sent. One thing that you will never want to happen to your email is to hit a spam trap.
What a Spam Trap
First let us see what a spam trap actually means. All the inactive email IDs that users have created and left unused are, after a certain time period made in dormant state . Users can’t access these emails. Such email addresses are sometimes re activated and used by certain ISPs as “spam traps” only to determine whether you are sending mails to inactive mails ,older mails or nonexistent mails.
Another type of spam traps are the ones which are purposely created in order to find out whether they are receiving any kind of mail which they have not subscribed for. These are not real users. Such emails are circulated around the web with the help of some anti-spam organizations through forums, blogs etc.
So when you hit one of these, your IP is blacklisted and major ISPs filter out your messages till your IP is removed from the blacklist. This will obviously do no good to your reputation as a mass mail sender.
Yes, there are some unfortunate ways through which spam traps get into your mailing lists.
Inactive emails: As mentioned earlier when you include old and inactive mails in your list it might turn out to be a spam trap.
Purchased: Spam traps can be one of those emails that you have purchased.
Invalid and fake email addresses: Such address which is deliberately typed in by some users which are fake or invalid can be one such spam trap.
Bounce addresses: After being inactive for a while, some emails stop receiving any messages and can become spam traps.
From the web: When you try harvesting emails from the internet, some of them might be spam traps.
Take Some Steps And Prevent Your Email Campaign Ending In A Spam Trap
Do not include old, inactive mails in your list.
It is a good option to exclude subscribers who have not opened your emails for a long time.
To avoid people typing in fake emails, strengthen your sign-up process.
Try to include a double-opt-in method.
Remove all those emails from which messages are bounced back.
Never try to harvest your mailing list from the net.
Exclude all the recipients who have unsubscribed from your mail campaign.
Identifying spam traps in your mailing list is next to impossible. Your mailing list might consist of millions of emails and finding spam traps in them is like searching for a needle in a hay stack.
So it is best to take some measures to prevent these traps from entering your list.