MM-SUS scenario (vendor replication process)

Dear SAP,

I have searched in SAP Business Partner Maintenance in SAP Supplier Self-Services - Service Procurement - SAP Library but there are some points i am not clear. please your advise on below questions.

1) After running BD14 - replicate supplier data into SUS system, system will automatic create user account and business partner? Or this is done manually?

2) What if there are 2 suppliers sharing the same email address, will it cause any issue during vendor replication?

3) Does system allow one contact person to have relationship with two business partner in SUS system?

Regards,

William