Mahāsaṅghika Vinaya
Bhikkhunī Vibhaṅga
Suspension 1
Explanation of the 19 saṅghādisesa rules, part 1.
“Accepting to act as a messenger” is as explained in detail in the bhikkhu rules. This is what the World-honored One said.
Final Ruling
If a bhikkhunī accepts to act as a messenger to unite a man and a woman, whether for a marriage or an affair, even for just one moment, it’s an immediate sanghadisesa offense.