Email not sending in local hosts in UI console

there are 2 local hosts and trying to send email alert from localhost1 to localhost2;

Sender Email

what will be localhost1 email??
#cluster name: 1


what will be localhost2 email??
#cluster name: 2

can u please say both email address

Hi There ,
Under Email server Settings
Host : Enter your email host address
port : enter email host port number ( usually it will be 25)
user Name & password : Can be left blank if your server is not configured to have one or if you have configured then enter credentials .

Email settings
Sender email : can be your email id or ( you can just put

recipients :
Here you need enter the email address where you want to send this alerts (it can be group email id or bynch of individual email ids )


[5 Feb, 2020, 10:19:15 PM] - IP address seems to have changed. Unable to listen on ‘ns_1@cb.local’. (POSIX error code: ‘nxdomain’)

Could not send email: {error,retries_exceeded,
{error,nxdomain}}}. Make sure that your email settings are correct

this was error am facing
normal email like “” will it work??

and do both sender and reciever want any kind of sharing like node,cluster??