TRuncate all lines AFTER the one that matches and deliver to normal mail

I need to trim down 100k bounce messages, but make SURE the e-mail
address that bounced is not trimmed out of them. SO a fixed X lines
truncate will not work. i need to search on a string theat is guaranteed
to be there after the email address, strip content length heders, and
truncate everything after that unique string.

furthermore, i need to do this without temp files of any kind. the
instant the magic string shows, the e-mail up to that point needs to be
writtem tthe normal mailbox, but no further.

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