I use LiSA (Liquid Information Speaking Assistant) on my Powerbook G4.
 This program gives me an audio announcement of incoming emails with a
human voice, and also gives a notification box (mini LiSA)showing the
first 8 characters of the of the sender's address.  "Mini LiSa" always
shows the last incoming email address, even if the email has been
deleted from my Apple Mail or .Mac account.  I recently noticed a
"mini LiSA" showing an incoming email within the previous hour with an
address beginning  =?ISO-88...   However, there was no email
associated with it that I could find in my account.  This has never
happened before.  I've been plagued for the last couple of months with
what appear to be phishing attempts in the form of emails with random
addresses and attachments which I do not open.  When bounced, they
usually come back to me as "Failed Delivery".   Could the two be
linked?  Can someone send an information gathering program through an
email that does not actually show up as an email?

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Clarification of Question by bellanca-ga on 03 May 2006 18:48 PDT

Also, is there significance to the  =?ISO-88...  sender's address?

iso8859-1 (and -8, etc) is a name of a common font used which will
display most English and Latin American letters.  But, it doesn't
sound like something that should appear in an e-mail.