Foreach ($line in $valuesfield){
$PosIdentity = $line.identity;
$PosUser = $line.user;
$PosRight = $line.right;
$PosInheritance=$line.inheritance;
If (-NOT(validate $PosIdentity){"$PosIdentity was not found!";Exit 2}
ElseIf {(-NOT(validate $PosUser){"$PosUser was not found!";Exit 3}
Else{
$ErrorActionPreference="stop";
#Dynamic change begins
trap {"Error in the allocation. `n let's try the other changes";continue}
Add-MailboxPermission -Identity $PosIdentity -User $PosUser -AccessRights $Posright -Inheritance $PosInheritance;
}