Many people like to use different email addresses for different groups.  Under Yahoo groups, We could join a group and then state the address we preferred to use for that specific group.  I have search the options and there is no way to add a preferred address to that one group.  The option definitely should be added to the subscription options for a specific group.

Ex:preferred email address you want to use for this group.   NOTE: it is not changing the .io. account main email. Just the group preference address
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Thanks,
 Judy