PowerShell: A drive with the name '#{Path=C' does not exist - powershell

Question

I'm trying to search through a directory of files and pull out all the file paths that have the pattern. Then loop through each file and search for another pattern of text. It works if I manually do:
Select-String -Path "C:\inetpub\mailroot\Badmail-Archive\003c908531613052021000000A2.BAD" -Pattern ('Final-Recipient') | Select -ExpandProperty line
It does not if I do it in the loop:
$FileList = Get-ChildItem "C:\inetpub\mailroot\Badmail-Archive" -Filter *.BAD | Select-String -Pattern 'Diagnostic-Code: smtp;550 5.1.1' | Select-Object Path
$FileList += Get-ChildItem "C:\inetpub\mailroot\Badmail-Archive" -Filter *.BAD | Select-String -Pattern 'Diagnostic-Code: smtp;550 5.1.2' | Select-Object Path
$FileList += Get-ChildItem "C:\inetpub\mailroot\Badmail-Archive" -Filter *.BAD | Select-String -Pattern 'Diagnostic-Code: smtp;550 5.2.1' | Select-Object Path
foreach($filepath in $FileList) {
$BADSearch = Select-String -Path $filepath -Pattern ('Final-Recipient') | Select -ExpandProperty line
$eMailAddress = $BADSearch.Split(";")[1]
echo "File Path: $filepath"
echo $eMailAddress
}
File Path: C:\inetpub\mailroot\Badmail-Archive\003c908531613052021000000A2.BAD
Select-String : Cannot find drive. A drive with the name '#{Path=C' does not exist.
At C:\Scripts\BadEmails-SQLGenerator.ps1:46 char:14
+ ... BADSearch = Select-String -Path $filepath -Pattern ('Final-Recipient' ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : ObjectNotFound: (#{Path=C:String) [Select-String], DriveNotFoundException
+ FullyQualifiedErrorId : DriveNotFound,Microsoft.PowerShell.Commands.SelectStringCommand

Answer 1

Your problem is with treating any arbitrary object as if it's a string. Select-String expects a string instance for the Path parameter, but you're passing it the resulting MatchInfo object returned from the previous Select-String call.
You'll need to tease out the path by selecting the .Path member from the previous command output:
Select-String -Path $filepath.Path # ...