Adding secondary SMTP for a user in office 365 using Powershell

1st : Prepare a CSV user file 

The structure of a CSV file that we use in our scenario. In the following screenshot, we can see an example of a CSV file

• The column named – Recipient (number 1), contain our “recipient’s identity”. Technically speaking, we can use various recipient properties for defining the “recipient identity.”
• The column named – PrimaryEmail (number 2), contain a user E-mail address that we would like to set as a “Primary E-mail address.”
• The column named – AliasEmail (number 3), contain a user E-mail address that we would like to set as
  an “Alias E-mail address.

2nd : Run Power Shell as administrator.

3rd : Connect Power Shell to Exchange.

Set-ExecutionPolicy -ExecutionPolicy RemoteSigned

$UserCredential = Get-Credential

$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/ -Credential $UserCredential -Authentication Basic -AllowRedirection

Import-PSSession $Session

NOTE : Use global admin login credential to connect with exchange online.

4th : We “fetch” the information stored in the CSV file, by defining a variable that includes the content of the PowerShell command – Import-CSV.

$Recipients = Import-Csv C:\Temp\Recipient-E-mail-addresses.csv

5th : Update Primary + Proxy E-mail address by importing information from a CSV file | Bulk mode

Foreach ($Mailbox in $Recipients){Set-Mailbox -Identity $Mailbox.Recipient -EmailAddresses $Mailbox.PrimaryEmail,$Mailbox.AliasEmail #-WhatIf}

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