SP2019 - unable to email - test with SP2013 workflow and incoming email

Ran into this and opened a ticket with Microsoft, just got it resolved with this.
SharePoint 2019 - new farm March 2022 CU.
We couldn't get emails to work. We could Telnet email, and could PowerShell emails. However Alert-Me - didn't work; SharePoint 2010 / 2013 emails didn't work. We then ran this and checked, it said that Outbound Email was using SSL - yes - HOWEVER it should NOT be enabled. So we then set it to False and checked and emails all worked in alerts and in SP2010 and SP2013 workflows!

PS C:\Users\Service.spfarm> $webapp=get-spwebapplication "https://DNSName-notServerName"
PS C:\Users\Service.spfarm> $webapp.OutboundMailEnableSSL
True
PS C:\Users\Service.spfarm> $webapp.OutboundMailEnableSSL =$false
PS C:\Users\Service.spsfarm> $webapp.update()
PS C:\Users\Service.spfarm> $webapp.OutboundMailEnableSSL
False
PS C:\Users\Service.spfarm>


Run these to use the DNS name of your farm https://SharePointFarmNameHere (NOT the FQDN or NETBIOS name of your server - SPFarm2019-0) (NO!)

$webapp=get-spwebapplication "https://DNSName-notServerName"
$webapp.OutboundMailEnableSSL

That will tell you TRUE or FALSE.

To change it to false (to change it to true, change $false to $true)

$webapp.OutboundMailEnableSsl =$false

Then update it:
$webapp.update()

Then check the value, hopefully (IF YOU WANT IT TO BE FALSE) it should be T or F.
$webapp.OutboundMailEnableSSL