The only time you will likely see the codes is if there is a problem. Each one has its own set of codes that provide information about a variety of events related to the delivery of emails. The Simple Mail Transfer Protocol (SMTP) and Extended SMTP (ESMTP) are two commonly used protocols. When you send an email, certain sets of rules, or protocols, are used to deliver it. Trying to determine why your emails bounced back can be frustrating since the notifications usually contain error codes accompanied by cryptic error descriptions. If you send email regularly, you likely have received them - those notifications saying that the email you just sent was undeliverable.
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