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Try: split -dl500000 -a1 file fileThis will create file0, file1, ..., each having 500000 lines or less.

Take a look at split. E.g:
split -l 500000 infile

perl -e 'while(<>) {@words=split; foreach $w (@words) {$w=~s/\.$//;print "$w\n" if $w=~/.[@]./}}' infile

try:
perl -e 'while(<>) {@words=split; foreach $w (@words) {print "$w\n" if $w=~/.[@]./}}' infile

Try this:

grep -oiE '\b[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}\b' infile

Will this serve your purpose?
awk ' { for(i=1; i<=NF; i++) { if($i ~ /@/) print $i } } ' filename

tr -d '"'
should delete the " character

sed -e 's/\"//g' filename > newfile


or for inline editing:

sed -i -e 's/\"//g' filename