Most emails fail to reach inbox because of one thing founders ignore

Been building in the cold email space and noticed something:

Most founders assume poor results = bad copy.

But a lot of the time, emails never even reach the inbox.

So they:

rewrite sequences

tweak offers

switch tools

while the real issue is deliverability

At small scale, everything looks fine.

Once you ramp volume, inbox placement drops quietly.

No warning. Just fewer replies.

Curious how many here actually check inbox placement before scaling?