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But the bigger threat is behind spam trap email accounts.
Some ISPs turn abandoned email addresses into spam trap mailboxes.
Setup a free account on G-Lock Analytics email tracking service if you don’t have it yet and start tracking opens and clicks for your email campaigns right away in order to diagnose possible blacklisting issues as soon as possible.2.
Monitor complaints from your recipients about not receiving emails.
If you take a list that you have not emailed to for a year or two, it’s likely to contain many invalid and spam trap emails just like a list that you would scrape on the Internet.3. If you don’t have your own SMTP server and send emails from a shared mail server, your reputation depends on that server reputation.
Most of the time spam trap email addresses are met in very old and harvested email lists.A certain number of bounced emails after each email campaign is normal.