I have used Thunderbird to send an email newsletter to a list for several years. Now it doesn't work and says it is not a valid email address.
It worked fine on 8/21, now it doesn't on 8/25
It worked fine on 8/21, now it doesn't on 8/25
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Update: I broke my list into smaller segments (max of 12 per list) and that worked fine. So apparently the problem with this latest release is list size, even though the error message doesn't say that.