Every sender in the world has a spam placement rate (SPR%).
The question isn't whether some emails land in spam - it's how much and does it present a problem?
There are three different things "going to spam" actually means
1) Provider-decided spam placement (algorithm filters your email)
2) Subscriber-reported spam (a human clicks "this is spam")
3) Delivery rejections (the server blocks it entirely)
They are not equally serious and they need completely different responses.
0-15% spam placement rate is broadly normal for each email send
What matters is whether it's sustained or a short-term spike, because the response to each is completely different.
And B2B has it even harder.
Most corporate environments have two layers of filtering - the hosting platform AND a corporate security filter (Proofpoint, Mimecast, Cisco).
Emails can disappear into an admin quarantine queue with no trace in your data at all
The full guide covers what changed, how to actually test your spam placement, what to watch for, and what to do when you have a real problem.
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