You should put <code> tags around it. Anyway, you're reading the file into @mailf, but each of the lines have newlines at the end. Including your filename. Instead, you may want to do this:

open(FILE, $mail);
@mailf = map { chomp; $_ } <FILE>;
close(FILE);
# now process $mail[n]
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update: fixed map. Actually you could just go:

@mailf = <FILE>;
chomp(@mailf);
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