in reply to search and replace
Just remove the "xmlfeedback" and add it to the end of the line if the line matches:
perl -pe 's/xmlfeedback //,s/$/ xmlfeedback/ if /^mail xmlfeedback -s +"feed invalid for agent .*"/'
لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ
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Seekers of Perl Wisdom