| McGeorge, James | South Australia | Constructed the first telegraph line in SA (illegally). |
| McGowan, Samuel | Victoria | Brief biographical summary. |
| Magpies | Interruptions to the telegraph lines. | |
| 1867 Report | Ocean Postal Communication. | |
| Marconi | On board ships. | Forms. |
| Development of wireless technology. | ||
| Marriage | Queensland | Nurses cannot work after marriage. |
| USA | Marriage by Telegraph. | |
| Measurements | Metric and Imperial as well as currency ($ and £). | |
| Mathematical names | Queensland | Alpha, Beta and Delta |
| Meeting by Zoom | Melbourne CTO | Meeting for 4 hours using the telegraph directly. |
| Melba, Dame Nellie | Victoria | Cover to P. M. Billy Hughes with T.O. Coldstream date stamp. |
| Melbourne Cup | Corowa | Leaking information from the Corowa Office. |
| Messages - tying up the lines | Broken Hill and New York | Tying up the telegraph lines with long messages and the Bible. |
| Messages - short | Tasmania | Shortest message recorded (TC-DO-3E). |
| Messengers | Home page | All aspects including recruitment, age, conditions and uniform. |
| What was not a uniform. | ||
| South Australia | Recollections of a 14 year old Messenger at Tanunda - Mr. H. Schreoder. |
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| New South Wales | The girl Telegraph Messenger did not await a reply at Redfern. | |
| Reuters | Image of a lovely young girl who was a mesenger for Reuters in London. | |
| Australia/Victoria | Labels for URGENT LETTERS for delivery by TELEGRAPH MESSENGER. |
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| Meterological | ||
| Mine information | Western Australia | Detailed technical description of the Mallina Gold Mine. |
| Money Orders | Australia | Overview of the Telegraphic Money Order system. |
| Forms used for receipt. | ||
| New South Wales | Development of the telegraphic MO system and forms used. | |
| Queensland | Development of the telegraphic MO system and forms used. | |
| South Australia | Todd's 1858 proposals. | |
| South Australia | Development of the telegraphic MO system and forms used. | |
| Tasmania | Development of the telegraphic MO system and forms used. | |
| Victoria | Development of the telegraphic MO system and forms used. | |
| Western Australia | Development of the telegraphic MO system and forms used. | |
| New Zealand | ||
| Morgan the Bushranger | New South Wales | Around Jerilderie and an idea of using the telegraph to catch him. |
| Morse Code | Summary of the use of the code in Australian telegraphy and the actual code. | |
| Morse code translator - text to code and vice versa. | ||
| Multiple telegrams | Australia | |
| Murder | Tasmania | The ancestry of the Southport Telegraph Office. |