SMTP: \r\n\r (without second \n) as double newline

Question

I have SMTP parser that works mostly fine. There is a problem when receiving traffic from third party software that sends double newlines as \"\\r\\n\\r\" (without the second \"

Answer 1

RFC2821. Section 2.3.7:

SMTP commands and, unless altered by a service extension, message
data, are transmitted in "lines". Lines consist of zero or more data
characters terminated by the sequence ASCII character "CR" (hex value 0D) followed immediately by ASCII character "LF" (hex value 0A).

http://www.ietf.org/rfc/rfc2821.txt

--Dave