Release not sending via eMail

We are on R12 and I am creating a release automatically through Min-Max report, however, it is not getting transmitted via eMail to the vendor.

- Our proxy and email server is set up to send emails outside as we are using iProcurement and it is sending eMails to the vendor

- I have done the following setups:

     - Entered an email address at the supplier site level

     - Entered Ship-to location

     - Created a BPA with all the lines

     - Created a sourcing rule

     - created ASL with mapping to the BPA line and set to 'Auto create release'

     - Run Min-Max with auto replenish set to 'Yes'