fix: Don't block email headers from being added if they have a line break in them
fix: Don't block email headers from being added if they have a line break in them

SteveClement/MISP,FloatingGhost/MISP,FloatingGhost/MISP,TheDr1ver/MISP,Rafiot/MISP,MISP/MISP,FIRSTdotorg/MISP,devnull-/MISP,MISP/MISP,SteveClement/MISP,TheDr1ver/MISP,devnull-/MISP,Rafiot/MISP,SteveClement/MISP,TheDr1ver/MISP,MISP/MISP,TheDr1ver/MISP,FloatingGhost/MISP,SteveClement/MISP,Rafiot/MISP,Rafiot/MISP,FIRSTdotorg/MISP,devnull-/MISP,devnull-/MISP,MISP/MISP,FloatingGhost/MISP,MISP/MISP,FIRSTdotorg/MISP,SteveClement/MISP,FIRSTdotorg/MISP