Joseph,
Adam, myself and a couple of others, I Have done transfers from
mailman. We simply did the correct dad, which allows you to put in 20
addresses at a time.
Actually, there is no explicit limit to how many addresses you can submit at one time to Direct Add. However if you submit more than 20 in a 24-hour period your action may be held pending review by Groups.io.
Emphasis on the word "may", I was only held the first time I submitted a couple hundred addresses, and the hold was less than 24 hours. But Groups.io was smaller then, and support less busy, so your mileage may vary.
Shal
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