We recently had a client at an Email Service Provider ask us - why do you need to use seed addresses to monitor your inbox placement? We can just monitor inbox placement with our 'regular' delivery reporting (based on SMTP logs). The short answer is that mail will be accepted for delivery but not be put into the inbox - it's placed in the junk mail folder or accepted for delivery and simply deleted (in my experience, that is less common).
So how frequently is that a problem? Pretty frequently it turn out. We took a look at all our clients' campaigns using our mailbox monitor tool for the last 30 days. We found that across all ISPs, about 55% of the time, a delivery problem meant having a message put in a junk mail or bulk mail folder. That number is larger at the some of largest mail providers:
So, that's why you need to monitor mail streams with seed lists.
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