Odoo is the world's easiest all-in-one management software. It includes hundreds of business apps:
CRM | e-Commerce | Accounting | Inventory | PoS | Project management | MRP | etc.
For outgoing mail server, First you need to check that you have given outgoing rights from your yahoo setting?
Then you need to set port and server details: https://help.yahoo.com/kb/SLN4724.html?guccounter=1
But i think you have perfectly setup config.
Please refer this answer that already raised:
Hope it will useful for you..