Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) says: "It is not appropriate for anyone to send salah (blessings) upon anyone except upon the Prophet (peace and blessings be upon him)."
Al-Tabarani recorded it as a 'mawquf' report, and its narrators are the narrators of the 'Sahih'.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الأدعية / 17320
Hadith Gradingمحدثین:إسنادہ صحیح
Hadith Takhrij«اخرجه الطبراني فى المعجم الكبير “ (11813)»