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The advantage of Mailgrams over postal mail was speed and verifiability of transmission; they were widely used in official notifications and legal transactions. Their advantage over full-rate telegrams was lower cost while still maintaining the look and feel of an important Western Union Telegram. The Mailgram quickly became a widely used medium for business-to-consumer communications.
- Oslin, George P. (1999). The Story of Telecommunications: From the Deep South to the Top of the Big Apple. Mercer University Press. p. 417. ISBN 978-0-86554-659-2. Retrieved 2009-02-01.
- iTelegram Mailgram description
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