If I send an email blast two two lists at the
same time and someone is subscribed to both lists, will they get
No. The email system has rules and filters in place that prevent
someone from receiving two copies of the same email)
An example: Janet is subscribed to two of your email newsletters
(List A and List B) and when you send your email you select to
send the message to both lists at the same time. Janet would only
receive one copy of the message.
More notes on duplicates and removing
them from your lists. Information on sending
a message could
also be helpful.