SENDMAIL{...} -- send e-mail from actions in TWiki topics, useful for workflow automation

• The %SENDMAIL{}% variable is handled by the SendMailPlugin.
• Syntax: %SENDMAIL{ action="send" ... }%
• Parameters:

  Parameter	Description	Default
  action=""	Only action="send" is supported, it will send an e-mail	"" (no action)
  excludetopic="MyTemplate"	Exclude action for named topic. Typically used in a template topic containing the SENDMAL variable to disable the action when viewing the topic.	"" (no exclude)
  from="admin@example.com"	E-mail address or WikiName of sender. If a WikiName is specified, the registered e-mail of that person is used. Supported tokens: • $webmastername - name of TWiki administrator. • $webmasteremail - e-mail of TWiki administrator. • $username - WikiName of logged in user. • $useremail - e-mail address of the logged in user. Defaults to TWiki administrator. See note on open mail relay.	"$webmastername <$webmasteremail>"
  to="jom@example.com"	To list: Comma-space delimited list of e-mail addresses or WikiNames of adressees. Same tokens supported as in from="". Defaults to TWiki administrator.	"$webmastername <$webmasteremail>"
  cc="jimmy@example.com"	CC list: Comma-space delimited list of e-mails or WikiNames. Same tokens supported as in from="".	""
  bcc="boss@example.com"	BCC list: Comma-space delimited list of e-mails or WikiNames. Same tokens supported as in from="".	""
  subject="Any text"	E-mail subject. Text may include TWikiVariables such as %URLPARAM{subject}%, and format tokens such as $n and $percnt.	(help message)
  text="Any text" or plaintext="Any text"	E-mail body in plain text format. Text may include TWikiVariables and format tokens.	(help message)
  htmltext="Any HTML"	E-mail body in HTML format, optional. Text may include TWikiVariables and format tokens. Double quotes need to be escaped, such as <a href=\"http://twiki.org/\">TWiki.org<a>. A MIME Multi-Part message is sent if both, plaintext and htmltext are specified.	""
  onsuccess="..."	Text shown in place of the SENDMAIL variable on success, default is empty. Text may include TWikiVariables and format tokens.	""
  onerror="| $error ||"	Error message shown in place of the SENDMAIL variable on error, if any. Text may include TWikiVariables and format tokens. Token $error expands to the error message.	"$error"

• Security: See note on how to avoid an open mail relay
• Example:
  %SENDMAIL{ action="send" to="$username <$useremail>" subject="Status change" text="Status changed to %FORMFIELD{Status}%" }%
• Category: DevelopmentVariables, EmailAndNotificationVariables, WorkflowAndAutomationVariables
• Related: SendMailPlugin