I've played with this before. A correctly implemented mail library should handle e.g., subject lines that contain SMTP control characters. I developed a lengthy

I've played with this before. A correctly implemented mail library should handle e.g., subject lines that contain SMTP control characters. I developed a lengthy repro for an email parsing issue in an ancient version of some java email library that contained a truely horrendous parser, only to find out that the library had been updated internally recently :-)