Something like this to get server name and IP

declare @subject nvarchar (100)

declare @v-2 nvarchar(50)

set @v-2 = convert (nvarchar (50),case when CONNECTIONPROPERTY('local_net_address') is null then '' else CONNECTIONPROPERTY('local_net_address') end)

print @v-2

set @subject = 'SQL Agent Stopped, Please Check ' + @@SERVERNAME

print @subject

Probably a better way of doing it, this just just off the top of my head