According to Validity, there are four, simple steps that can increase the chances your messages will pass through filters and reach your subscribers.
Track your inbox placement
You can’t fix a problem you don’t know about. Having access to and monitoring your inbox placement rate will allow you to accurately judge the health of your program and can alert you when mailbox providers are blocking your messages.
Keep your list clean
Keeping a subscriber list free from spam traps, unknown users, and inactive subscribers will help boost your reputation and your ability to reach the inbox. Run your entire list through a list hygiene service and make sure any new addresses you add are verified as real, active email accounts.
Monitor your reputation
Your reputation is one of the main factors that mailbox providers use to determine whether to place your messages in the inbox or the spam folder. Always check your sender reputation before you send a new campaign to make sure mailbox providers will evaluate your messages favorably, improving your ability to reach the inbox.
You can learn more about the value of sender reputation in the Sender Score Benchmark Report.
Check to see if you’ve been blacklisted
Blacklists are lists of known spammers that mailbox providers reference when making deliverability decisions. Consult a blacklist lookup service to ensure your IP address hasn’t been blacklisted. If you find that you are listed, consult that specific blacklist’s delisting requirements, and follow their stated procedures.