Create a temp fold at c:\ called c:\temp and run the following script

$Groups = Get-DistributionGroup
$Groups | ForEach-Object {
$group = $_.Name
$members = ''
Get-DistributionGroupMember $group | ForEach-Object {
        If($members) {
              $members=$members + ";" + $_.Name
           } Else {
              $members=$_.Name
           }
  }
New-Object -TypeName PSObject -Property @{
      GroupName = $group
      Members = $members
     }
} | Export-CSV "C:\temp\Distribution-Group-and-Members.csv" -NoTypeInformation -Encoding UTF8

Get-Recipient | Select DisplayName, RecipientType, EmailAddresses

 to export the results to a csv file:

Get-Recipient | Select DisplayName, RecipientType, EmailAddresses | Export-Csv EmailAddresses.csv

to only list the primary email address:

Get-Mailbox |Select-Object DisplayName,PrimarySmtpAddress