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hi tatane
bmh means: bounced mail handler
if mails get bounced (recipient is no more valid, email is invalid, domain is invalid,...)
you should react. it makes not sense to send newsletters to invalid email-address.
in the included bmh you can quite a subscription, this is recommended for temporary problems, because quited subscription can be reactivated by the subscriber himself.
the second possibility in bmh is to delete a registration with all subscription to this email, if there is a permanent error when sending
more info you can read in help file
