Was it something you said?
There are lots of reasons why people want to unsubscribe and I say If you have inactive, unhappy subscribers that want to leave. Let them go.
It is very important to understand your visitors if you want to grow your list.
They are not your trusted followers. They are not your captive audience. They are people passing by in a crowd with little trust in what you have to say.
Anyone focused on email marketing sets out to build a good healthy subscribers list.
The problem is that collecting emails through a variety of sources can lead to a mixed bag of quality.
In the good old days of email marketing (say, 2 years ago), email providers focused largely on