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How to fold X-Brightmail-Trakcer header

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Article ID: 175485

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Updated On:

Products

Messaging Gateway for Service Providers

Issue/Introduction

How should the X-Brightmail-Trakcer header be folded.

Resolution

According to RFC5322 "Internet Message Format", it is recommended that an MTA split a long header line into multiple lines.

https://tools.ietf.org/rfc/rfc5322.txt

2.1.1.  Line Length Limits
   There are two limits that this specification places on the number of
   characters in a line.  Each line of characters MUST be no more than
   998 characters, and SHOULD be no more than 78 characters, excluding
   the CRLF.

2.2.3.  Long Header Fields
   each header field is logically a single line of characters comprising
   the field name, the colon, and the field body.  For convenience
   however, and to deal with the 998/78 character limitations per line,
   the field body portion of a header field can be split into a
   multiple-line representation; this is called "folding".  The general
   rule is that wherever this specification allows for folding white
   space (not simply WSP characters), a CRLF may be inserted before any
   WSP.


Symantec recommends that an MTA which integrates with SMG-SP fold the X-Brightmail-Tracker header, 
so that the number of characters on each line does not exceed 78 characters.