X-Zammad-Priority: (1 low|2 normal|3 high)
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Set priority of ticket (for whole list check your database).

X-Zammad-Group: [one system group]
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Presort of group (highest sort priority).

X-Zammad-Owner: [login of agent]
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Assign ticket to agent.

X-Zammad-Ignore: [yes|true]
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Ignore this email.

X-Zammad-State: (new|open|...)
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Set state of ticket (for whole list check your database)! Be careful!

X-Zammad-Article-Sender: (Agent|System|Customer)
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Info about the sender.

X-Zammad-Article-Type: (email|phone|fax|sms|webrequest|note|twitter status|direct-message|facebook|...)
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Article type (for whole list check your database).

X-Zammad-Article-Visibility: (internal|external)
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Article visibility.

X-Zammad-Customer-Email: [email address]
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Set customer via explicit email.

X-Zammad-Customer-Login: [login]
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Set customer via explicit login.