Get all Hex and Rackspace mailboxes for your account, and any indirect accounts.

Get-AllMailboxes.ps1

## This code released under the MIT open source license.
## See here for details: https://opensource.org/licenses/MIT
## This code is provided with NO SUPPORT and NO WARRANTY and NO GUARANTEE. Use at your own risk.

[string] $ApiKey = ""
[string] $ApiSecret = ""
## only populate $indirectAccountNumber if you want a list from one specific account, otherwise leave blank.
[string] $indirectAccountNumber = ""
[string] $path = "AllMailboxes.csv"

[string]$UserAgent = $account
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls11

function Start-Throttle() {
    Start-Sleep -Seconds 1
}

function Get-XapiSignature($userAgent, $apiKey, $apiSecret) {
    $dateTime = [DateTime]::UtcNow.ToString("yyyyMMddHHmmss");
    $dataToSign = [String]::Format("{0}{1}{2}{3}", $apikey, $userAgent, $dateTime, $apiSecret);
    $sha1 = [System.Security.Cryptography.SHA1]::Create();
    $signedBytes = $sha1.ComputeHash([System.Text.Encoding]::UTF8.GetBytes($dataToSign));
    $signature = [System.Convert]::ToBase64String($signedBytes);
    $sha1.Dispose()
    [String]::Format("{0}:{1}:{2}", $apikey, $dateTime, $signature);
}

function Get-AllDomains($account) {
    $allDomains = @()
    $offset = 0
    do {
        $url = "https://api.emailsrvr.com/v1/customers/all/Domains?size=250&offset=$offset"
        if ($account) {
            $url = "https://api.emailsrvr.com/v1/customers/$account/Domains?size=250&offset=$offset"
        }
        Write-Host $url
        $domains = Invoke-RestMethod $url -Headers $headers -Method Get -UseBasicParsing
        $allDomains = $allDomains + $domains.domains
        $offset = $offset + 250
        Start-Throttle
    } while($allDomains.Count -lt $domains.total)
    $allDomains
}

function Get-AllRseMailboxes($domainName) {
    $allMailboxes = @()
    $offset = 0
    do {
        $url = "https://api.emailsrvr.com/v1/customers/all/Domains/$domainName/rs/mailboxes?size=250&offset=$offset"
        Write-Host $url
        $mailboxes = Invoke-RestMethod $url -Headers $headers -Method Get -UseBasicParsing
        $allMailboxes = $allMailboxes + $mailboxes.rsMailboxes
        $offset = $offset + 250
        Start-Throttle
    } while ($allMailboxes.Count -lt $mailboxes.total)
    $allMailboxes
}

function Get-AllHexMailboxes($domainName) {
    $allMailboxes = @()
    $offset = 0
    do {
        $url = "https://api.emailsrvr.com/v1/customers/all/Domains/$domainName/ex/mailboxes?size=250&offset=$offset"
        Write-Host $url
        $mailboxes = Invoke-RestMethod $url -Headers $headers -Method Get -UseBasicParsing
        $allMailboxes = $allMailboxes + $mailboxes.mailboxes
        $offset = $offset + 250
        Start-Throttle
    } while ($allMailboxes.Count -lt $mailboxes.total)
    $allMailboxes
}


$signature = Get-XapiSignature $userAgent $apiKey $apiSecret

$headers = @{
	"Content-Type" = "application/x-www-form-urlencoded";
	"Accept" = "application/json";
	"User-Agent" = $userAgent;
	"X-Api-Signature" = $signature
}

$allMailboxes = @()
$domains = Get-AllDomains $indirectAccountNumber
foreach ($domain in $domains) {
    Write-Host $domain.name"  "$domain.serviceType"  "$domain.accountNumber

    if ($domain.serviceType -ne "rsemail" ) {
        $mailboxes = $null
        $mailboxes = Get-AllHexMailboxes $domain.name
        $allMailboxes = $allMailboxes + ( $mailboxes | % { New-Object –TypeName PSObject –Prop (@{"account"=$domain.accountNumber; "domain"=$domain.name; "type"="hex"; "mailbox"= $_.name; }) } )
    }

    if ($domain.serviceType -ne "hex") {
        $mailboxes = $null
        $mailboxes = Get-AllRseMailboxes $domain.name
        $allMailboxes = $allMailboxes + ( $mailboxes | % { New-Object –TypeName PSObject –Prop (@{"account"=$domain.accountNumber; "domain"=$domain.name; "type"="rsemail"; "mailbox"= $_.name; }) } )
    }
}

$allMailboxes | Export-Csv -Path $path -Encoding UTF8 -NoTypeInformation -Force
Write-Host "I found $($allMailboxes.Count) mailboxes!   All mailboxes exported to $path. "