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Dialcom Inc. was a United States corporation which developed the world's first commercial electronic mail service. It was founded in 1970 by Robert F. Ryan and was sold to ITT Corporation in 1982, becoming ITT Dialcom. Dialcom's e-mail software ran on Prime minicomputers and was licensed to governmental telecommunications providers in over seventeen countries. Various extra features could be offered by Dialcom-based services, including gateways to telex and fax, and online information retrieval services. In 1986, British Telecom, who used Dialcom software for its Telecom Gold service, bought Dialcom from ITT.

Dialcom systems[edit]

Each Dialcom system was allocated a two-digit identification number. This was used as a prefix for the Dialcom e-mail addresses (or "mailboxes"), thus allowing e-mail to be exchanged between different Dialcom services. By 1990, the following Dialcom systems were operating:

Country Service Systems
 Australia Minerva/Keylink 07, 08, 09
 Canada Infotex 20-24
 Denmark Databoks 71
 Finland Telebox 62
 Germany Telebox 15, 16
 Hong Kong Dialcom 88, 89
 Ireland Eirmail 74
 Israel Goldnet 05, 06
 Italy Mastermail 65-68
 Japan KDMINC 13, 14
 South Korea Dialcom 52
 Malta Telecom Gold 75
 Mexico Telepro 52
 Netherlands Memocom 27-29, 55
 New Zealand Starnet 01, 02
 Puerto Rico Dialcom 25
 Singapore Telebox 10-12
 Taiwan Dialcom 52
 United Kingdom Telecom Gold 01, 04, 17, 80-89
 United States Dialcom 29-34, 37, 38, 41-59, 61-63, 90-99

Time-sharing service[edit]

Dialcom began as computer time-sharing services. A user would sign on using a Teletype Model 33 ASR and a modem with acoustic coupler, running at 110 bps. A command-line interface was available with programming languages such as BASIC and Fortran. The Company grew and evolved quickly over a four-year period through a series of acquisitions led by Robert F. Ryan, Founder, President and CEO. By 1974 Dialcom was nationwide and offering a number of "off the shelf" products such as accounting and payroll services. Dialcom "reinvented" itself about every four years by coming out with a completely new product line (all related though the thread of telecommunications) to become the dominant leader in whichever area it targeted, while still supporting and growing the prior underlying services. In 1974 Dialcom developed an online word processing and document management suite of products. For one of its major clients, the US House of Representatives, Dialcom supplied a total constituent management system (CRS) to 240 of the 435 House offices. This service was also marketed to associations and large corporations. Four years later Dialcom developed and successfully marketed the first commercial email service in the US and then went international with that service. Mr. Ryan was the sole marketer and negotiator for all international sales that were done at the ministerial level in each country. In keeping with the corporate philosophy of constant innovation and evolution, during 1980 Dialcom was the creator, designer, developer, computing and network engine of "The Source".

Robert Ryan developed and executed a structured plan that led to over a decade of steady geographic and product growth with sustained and growing profitability. He identified, secured financing, negotiated and successfully acquired and merged six struggling companies resulting in the rapid growth and profitability of the parent company - steadily transforming a small computer service bureau into the world leader of electronic mail services with offices in nineteen countries. Dialcom was the first email service offered in the US or any other country and it controlled 35% and 98% US and international email market share respectively. International expansion was accomplished through strategic partnerships and joint ventures with the governmental telecommunications bodies in all major telecommunications consuming countries. Robert Ryan developed and negotiated all international licenses and partnerships. Market growth and profitability was constant through these intense periods of geographic and product expansion. In 1982 Robert Ryan negotiated the sale of Dialcom to ITT and remained as CEO for three years.

Concurrent with Dialcom and with the support of the Dialcom Board of Directors Robert Ryan was co-founder and president of Source Telecomputing Corporation. In concert with William VonMeister (deceased) Robert Ryan conceived, financed, designed, and implemented “The Source” - America's first consumer-oriented information service - the direct predecessor of AOL. After achieving dominant market share in its first year of operation, “The Source” was sold by management to Readers Digest. Mr Ryan has to date started or managed (at C level positions) over a dozen companies during his ongoing career. He is a long-standing supporter of entrepreneurship and has worked with educational institutions to further his beliefs.

Eric Schmidt, who would later become CEO of Novell and Google, worked for Dialcom during high school.


  • BT Connected Earth history of e-mail
  • Cornwall, Hugo (1988). The Hacker's Handbook III, revised edition, Century Hutchinson. ISBN 0-7126-1147-9
  • Clark, Tim (1990). Hints for Getting Mail through Various Gateways to and from JANET, issue 7, University of Warwick.
  • ComputerWorld Honors: An Oral History of Eric Schmidt