In cases where the Default Content Language is not set to English, users might experience incorrect counting of included recipients that have been added from the List Manager when creating email campaigns in the Email Experience Manager.
To resolve the issue, take the following steps:
<setting name="EXM.UseContextContentLanguage" value="true" />
<site name="exmapi" patch:before="site[@name='website']" rootPath="/noitem" virtualFolder="/sitecore/api/ssc/EXM" inherits="website" language="en" contentLanguage="en" />
and
<site name="lmapi" patch:before="site[@name='website']" rootPath="/noitem" virtualFolder="/sitecore/api/ssc/ListManagement" inherits="website" language="en" contentLanguage="en" />Important: This must be placed before all content site definitions.