Email isn’t delivered 100% of the time but an undelivered email isn’t necessarily void of opportunity. Bouncing blocked emails are returned to the email senders email address with code to tells you why the email was blocked.
Of course, email servers don’t exactly have a way with words, so I recommend using an email service provider that can classify your bouncing blocked emails and reports that are easier for humans to interpret. Bounce reports show you which email bounced and why they bounced, so that you can take appropriate action.
Emails that are permanently un-deliverable are called Hard Bounced. A hard bounce means that the email address does not exist so it’s an either misspell, address change or been abandoned by the owner.
When you see a hard bounce in your bounce report, you should either contact your subscribers via another method to obtain a new email address or simply delete them from your database. When your email bounce report shows an email return as mailbox full, temporarily un-deliverable or blocked, these situations are known as Soft Bounces.
Soft bounces may be temporary or permanent, so check your bounce report to see how often a particular email is bounced. If you notice three or more consecutive soft bounces for an email address, you should then treat it like a hard bounce. If you notice the regular soft bounces, you can try resetting your emails at a later date.
Remember, the best way to reduce blocked email, is to make sure your email list is up-to-date in the first place. Send an email once every three months or so reminding your subscribers to notify you of any updates, your subscription profile is where they can change their email addresses; that way you have a better chance of catching some of the email address changes before they show up one of bounce report. Another preventative measure is avoiding email filters that deliver your email to junk and spam folders, instead of bouncing emails back as un-deliverable.