Email with long lines

RFC5322

We allow long lines in email messages.

RFC5322 for 'Internet Message Format' says that each line of characters MUST be no more than 998 characters, and SHOULD be no more than 78 characters.

However, there are many email systems (eg recent Outlook versions) that will not wrap long lines properly. As a result, rather then us rejecting such messages, our incoming and outgoing email servers will allow long lines.

When we are given an email with lines over 998 characters we will add a header to explain this.

 X-AA-RFC5322: Message excedes RFC 5322 line Length Limits, but allowing it. (20479/998)

The 20479 in this example is the length of the longest line in the message.