public MessageInsightsFilters withIsp(String... isp) {
        if (this.isp == null) {
            setIsp(new java.util.ArrayList<String>(isp.length));
        }
        for (String ele : isp) {
            this.isp.add(ele);
        }
        return this;
    }
<p>
The recipient's ISP (e.g., <code>Gmail</code>, <code>Yahoo</code>, etc.).
</p>
<p>
<b>NOTE:</b> This method appends the values to the existing list (if any). Use
{@link #setIsp(java.util.Collection)} or {@link #withIsp(java.util.Collection)} if you want to override the
existing values.
</p>

@param isp
       The recipient's ISP (e.g., <code>Gmail</code>, <code>Yahoo</code>, etc.).
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-sesv2/src/main/java/com/amazonaws/services/simpleemailv2/model/MessageInsightsFilters.java