Manual methods can cause many difficulties for non-technical users, so I would like to suggest using a reliable tool to import EML to Yandex Mail. MacSonik EML Converter is a trustworthy tool and has many features, like if you have too many duplicate files, so it can be oversized and bulky. This software allows you to remove duplicate emails based on Mail, Body, From, and To. After the conversion, no duplicate files will appear in the resultant file. This powerful utility is highly compatible with all versions of Mac OS and Windows.