Trying to modify a script to use test-connections in multiple domains?

Question

Hey Scripting Guy!
I've created the script (below) to use test-connection against a list of hosts and write the results of the machines that respond to a .txt file. The only issue is that one of my sites utilizes two separate domains, does anyone have any advice as far as
when a test connection fails, retrying the command using another domain name? (server.domain.com)
I'll take any advice at this point... Thanks!
New-PSDrive -Name S -PSProvider FileSystem -Root \\server\share -ErrorAction SilentlyContinue
Get-ChildItem "S:\Folder1\Folder2\backup\backup Audits\Host Audits" -Filter *.txt | `
Foreach-Object{
    $content = Get-Content $_.FullName
    #$SiteName = Get-ChildItem "S:\Folder1\Folder2\backup\backup Audits\Host Audits"
    #Find alive machines, and write their hostnames to output file for auditing
    Test-Connection -count 5 -ErrorAction SilentlyContinue $Content | Select-object -unique | Out-File      "S:\Folder1\Folder2\backup\backup Audits\Audit results by Site\$_"

Answer 1

what i would like to do is when my test-connection fails with an error, append another domain suffix to the hostname so that if:
test-connection computerxyz fails
then test-connection computerxyz.domain.corp.com
$server="$computer.domain1.com"
if(Test-Connection $server -count 1 -quiet){
    $server="$computer.domain2.com"
    ... other code
¯\_(ツ)_/¯