get-DbaErrorLog send email

I need to disable different SQL Server logins on different servers and get an email if anyone tries to use them. Here is what I have an it works but it is not flexable enough. I need to be able to check for different login failures on different servers.

$attachment = "c:\downloads\errors.csv"
$loginerrors  = @()
$errorCount = Get-DbaErrorLog -sqlinstance myServerName,my2ndServer -LogNumber 0 -text "login failed for user 'sa'" -after '2019-04-25'

$loginerrors = Get-DbaErrorLog -sqlinstance myServerName,my2ndServer -LogNumber 0 -text "login failed for user 'sa'" -after '2019-04-25' | select-object ComputerName,LogDate,Text | export-csv -path $attachment
if ($errorCount.Count -gt 0) {
    $subject = "failed logins"
                             }
Send-MailMessage -From "joe@msn.com" -To $recipients -SmtpServer myMailServer.com -Body "see attachment"  -Subject $subject -Attachments $attachment

Just off the top of my head, maybe try this…

$ServerList = @('myServerName','my2ndServer') # add as many servers as needed
$attachment = "c:\downloads\errors.csv"
$loginerrors  = @()
$errorCount = ForEach($TargetInstance in $ServerList)
{Get-DbaErrorLog -sqlinstance $TargetInstance -LogNumber 0 -text "login failed for user 'sa'" -after '2019-04-25'}

$loginerrors = ForEach($TargetInstance in $ServerList)
{
Get-DbaErrorLog -sqlinstance $TargetInstance -LogNumber 0 -text "login failed for user 'sa'" -after '2019-04-25' | 
select-object ComputerName,LogDate,Text | 
export-csv -path $attachment -Append

}


if ($errorCount.Count -gt 0) 
{ $subject = "failed logins" }


$sendMailMessageSplat = @{
    Attachments = $attachment
    Subject = $subject
    SmtpServer = 'myMailServer.com'
    From = "joe@msn.com"
    Body = "see attachment"
    To = $recipients
}
Send-MailMessage @sendMailMessageSplat

I should have been a little more clear. I was to search the logs for:
login failed for joe
login failed for jim
login failed for mary

Get-DbaErrorLog only allows 1 string to search for. There may be 1 login which has been failing for years. I don’t want to get email alerts for that.