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According to Google Mail guidelines, bulk mail must contain the header
Precedence: bulk
What does it do? I could not find a RFC describing the effect on mail delivery.
Some background: I'm working on scripts that will send 500k+ mails daily. They are different kind of messages: account related mail (delivery critical), but also notifications of new content (delivery not critical).
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An email header is the area in which you enter important information above the email content area. The information in the header includes such things as the recipient, the sender, and a subject line with the option of sending copies to additional recipients.
An email header provides information about the sender and receiver of a message. Not to mention, the message route can help users check whether or not the message is legitimate and safe. Understanding the metadata of an email header helps to avoid malicious attacks.
The header is a detailed section of code that contains comprehensive information about where the email came from and how it reached its destination. Email headers will contain the originator's email address and the computer the sender was using.
An email header tells who sent the email and where it arrived. Some markers indicate this information, like “From:” — sender's name and email address, “To:” — the recipient's name and email address, and “Date:” — the time and date of when the email was sent. All of these are mandatory indicators.
The exact meaning of Precedence: isn't standardised, but it prevents some mail servers from sending vacation and bounce messages, and may be used by service providers to deprioritise bulk mail during busy times so that "personal" mail continues to be delivered quickly.
From RFC2076:
Non-standard, controversial, discouraged. Sometimes used as a priority value which can influence transmission speed and delivery. Common values are "bulk" and "first-class". Other uses is to control automatic replies and to control return-of-content facilities, and to stop mailing list loops.
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