Appendix A
Abbreviations
| Abbreviation | Definition |
|---|
| DNS | Domain Name Service |
| DNS MX record | Domain Name Service Mail eXchanger record |
| MTA | Mail Transport Agent. Software responsible for moving and queuing mail from one system or one process to another, usually over SMTP. |
| RBL | Realtime Block List |
| SMTP | Simple Mail Transport Protocol |
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