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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