Imām Shāfi’ī accepts mursal aḥādīth with three conditions

1. The mursil is from the kibār tābi’īn e.g. Sayyid bin Musayyab[1]
2. The mursil only does irsāl from a thiqah rawi[2]
3. The narration has support from one of the following four helpers:
   a) A musnad ḥadīth
   b) Another mursal ḥadīth 
   c) It conforms with the statement of a ṣaḥābah 
   d) The majority of ‘ulamā` act upon it 

Some Shawāfi’[3] have combined the above three conditions into two when accepting mursal narrations:

1. That the mursil is from the kibār tābi’īn
2. It has support from one of the following:
   a) Irsāl from a thiqah rāwī
   b) A musnad ḥadīth
   c) Another mursal ḥadīth 
   d) It conforms with the statement of a ṣaḥābah
   e) The majority of ‘ulamā` act upon it

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[1] This is because the ṣighār tābi’īn mainly narrate from other tābi’īn. 

[2] This is found when the mursal narration is corroborated with tawābi’ and shawāhid.  

[3] Like Ibn Ḥājar and Zarakhshī