Allow the upload of mailing lists to Plesk from MS Excel.
Utilize MS Excel or another list application to import mailing lists into Plesk mailing lists rather than having to type each individual address at a time.
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You can use API XML reqest for your purpose https://docs.plesk.com/en-US/onyx/api-rpc/about-xml-api/reference/managing-mailing-lists/adding-mailing-list.36138/
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