I entered "Outbound SMTP Server" address in Central Admin. Now I need to tell my SMTP server to accept emails from my farm. How do I find which server/IP address in the farm trying to send emails?

  • are you talking about the relay settings? – Waqas Sarwar MVP Apr 28 '15 at 18:58
  • The initial request to your outbound server will be coming from whichever WFE the user is connected to. – Omegacron Apr 28 '15 at 19:12

SharePoint WFE are responsible to send the emails to user. I think you are talking about the relay setting. You should enter the WFE Ips their.

  • IP addresses of Web Front End’s in you farm.
  • But if you want to use all servers in the farm then select all except the list below option.

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