Even though mail servers may be configured to silently discard email, the SMTP RFC strongly discourages this Except senders are regarded to become fraudulent or undesirable. For all other mail, the RFC suggests returning undeliverable mail with the mistake code. As indicated, it includes sending a single email to https://it-support73948.ttblogs.com/6252326/helping-the-others-realize-the-advantages-of-it-support