Softmarket's YMM (Yahoo Mass Messenger) allows you to
send the same message to Yahoo users from a list (just
a text file pasted into a text box ).

You can use multiple accounts in order to avoid yahoo
from blocking your account (yahoo blocks an account
that sends too many messages per minute to users that
are not in their friends list).

Also to check if your account(s) is still sending
messages you can use a verification account that
checks if the messages come through (since yahoo won't
notify you that your messages aren't going through)

Features:

* Multiple account send (you can add multiple -
unlimited - accounts )
* Easy add recipients (just paste them in the
message box) - you can paste even comma delimited
yahoo accounts

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