>The vulnerability was introduced many decades ago in Sendmail, by allowing the non-standard <LF> line ending in addition to the standard <CR><LF>. For compatib

>The vulnerability was introduced many decades ago in Sendmail, by allowing the non-standard <LF> line ending in addition to the standard <CR><LF>. For compatibility with programs that expect Sendmail behavior, the non-standard <LF> line ending was also allowed by other SMTP servers including Postfix and Exim. Sendmail, just say no.