How can I format-table with two different variables

Question

I have a script who's purpose is to go through all the mailboxes in exchange and look for any with SG_ or Group listed in the Full Access Permissions.  The script works though I'm having trouble formatting the data in a way that I can use it in Excel.
Ultimately I'd like it to report the Name of the mailbox and the name of the entry listed in the Full Access Permissions that has SG_ or Group in the name. Currently the output is the name of the mailbox and then on a separate line the full name of the security
group.
I'm trying to have it so that each part is in it's own column. That will make it easy to review in excel.
$Grabmailbox = Get-Mailbox -Resultsize Unlimited
foreach ($mailbox in $Grabmailbox){
$Getpermission = Get-MailboxPermission $mailbox | where { ($_.User -like "corp\SG_*") -or ($_.User -like "corp\*_group") }
if ($Getpermission -ne $null) {
echo "$mailbox +  "$Getpermission | FT User |Out-File c:\Script\VerifiedSG.txt -Append
else{
echo "$mailbox + No SG detected" | Out-File c:\Script\VerifiedSG.txt -Append

Answer 1

Hi Yan,
Thanks for the response but what I am looking for is even simpler than that.  
The script goes through every mailbox we have. 
It checks the Full Access Permissions for anything with SG_ or group listed in the Full access permissions.
It then should write out to a file the name of the mailbox and the entry in the Full access permissions that contains SG_ or _Group
so something like this:
Mailbox Name <---New ColumN--->Entry
Mailbox1<---New ColumN--->SG_Mailbox1
Ignore the <---New ColumN---> as I simply put that in to emphasize space between the two columns.