======POP3 Client Lua Scripting======

The POP3 Client [[http://wiki.pscs.co.uk/reference;lua_scripting|Lua Script]] is called POP3CLT.LUA and is edited in Settings -> Scripts. This script is called whenever VPOP3 runs a POP3 session to download messages from a remote POP3 server.

VPOP3 will call the following Lua functions in the script at the following times:
  * **Start()** - called when the POP3 session starts, before VPOP3 starts downloading any messages.
  * **DownloadRules()** - called before each message is downloaded to determine how VPOP3 should handle the message. A scripted version of normal [[http://www.pscs.co.uk/manual/download_rules.html|Download Rules]] in VPOP3.
  * **StartMessage()** - called just before VPOP3 starts downloading a message from the remote server.
  * **MessageLineRaw()** - called when VPOP3 has downloaded a line of a message from the remote server.
  * **MessageLine()** - called after VPOP3 has processed a line of a message from the remote server,just before it saves it.
  * **EndMessage()** - called when VPOP3 has finished downloading a message from the remote server.
  * **ProcessMessage()** - called after VPOP3 has downloaded a message from the remote server to determine if any special actions need to be performed on the message.
  * **End()** - called at the end of the POP3 session.


=====ProcessMessage()=====
''ProcessMessage("<mailfrom>", "<subject>", <recipient list>, <current actions>, <message MIME structure>, <message size>, <attachments>)''

This function is called by VPOP3 when a message has been received by the SMTP service.

  * <mailfrom> is the SMTP 'MAIL FROM' address
  * <subject> is the message subject line
  * <recipient list> is a table containing a list of the recipient email addresses (from the RCPT TO envelope)
  * <current actions> is a table with the following entries
    * SendToOriginalRecipients boolean - should the message be sent to the originally specified recipients
    * Delete boolean - should the message be deleted after retrieving
    * Ignore boolean - should the message be ignored
    * Reason string - text string to use if a reason is needed for the action
    * Recipients table - table containing new/replacement recipients for the message
    * HeaderModifiers table - list of message header modifications to make
  * <message MIME structure> is a table with one or more of the following entries
    * Path string - the IMAP style path to the message section
    * ContentType string - the main content type (eg 'text', 'image' etc)
    * ContentSubtype string - the content subtype (eg 'html', 'plain', 'gif', etc)
    * ContentTypeFilename string - the filename from the ContentType header
    * ContentDisposition string - usually 'inline' or 'attachment' or blank
    * ContentDispositionFilename string - the filename from the ContentDisposition header
    * Start number - the offset from the start of the message where this section starts
    * End number - the offset from the start of the message where this section ends
  * <message size> is the size of the message in bytes
  * <attachments> is a table with zero or more of the following entries, referring to the attachments in the message
    * MIMESection number - the MIME section that this attachment occurred in
    * Name string - the name of the attachment
    * MIMEType string - the MIME type of the attachment
    * Size number - the size of the attachment
    * Type string - the type of attachment (MIME, UUE, BINHEX, MIMEUUE, MIMEBINHEX, TNEF)

This function should return <new actions table>, <results string>

In this function the [[lua_scripting#only_in_pop3cltlua_and_smtpsvrlua_processmessage_function|VPOP3 ProcessMessage helper functions]] can be used.