Skip to content

New Member


1 Message

Saturday, October 23rd, 2021 3:28 AM

Error 452 4.1.0 TLS and Authentication required,

​Just started getting this error on failed mail delivery for external internet email on microsoft exchange server.​

​Receiving external internet mail just fine,. but can't send. All has been good for years, up to a few days ago.​


No Responses!