Enable (1) or disable (0) debug output. If enabled, SMTP
	commands and replies will be printed. Useful to debug TLS
	connection and authentication problems.

--batch-size=<num>::
	Some email servers (e.g. smtp.163.com) limit the number emails to be
	sent per session (connection) and this will lead to a failure when
	sending many messages.  With this option, send-email will disconnect after
	sending $<num> messages and wait for a few seconds (see --relogin-delay)
	and reconnect, to work around such a limit.  You may want to
	use some form of credential helper to avoid having to retype
	your password every time this happens.  Defaults to the
	`sendemail.smtpBatchSize` configuration variable.

--relogin-delay=<int>::
	Waiting $<int> seconds before reconnecting to SMTP server. Used together
	with --batch-size option.  Defaults to the `sendemail.smtpReloginDelay`
	configuration variable.

Automating
~~~~~~~~~~

--no-to::
--no-cc::
--no-bcc::
	Clears any list of "To:", "Cc:", "Bcc:" addresses previously
	set via config.

--no-identity::
	Clears the previously read value of `sendemail.identity` set
	via config, if any.

--to-cmd=<command>::
	Specify a command to execute once per patch file which
	should generate patch file specific "To:" entries.
	Output of this command must be single email address per line.
	Default is the value of 'sendemail.toCmd' configuration value.

--cc-cmd=<command>::
	Specify a command to execute once per patch file which
	should generate patch file specific "Cc:" entries.
	Output of this command must be single email address per line.
	Default is the value of `sendemail.ccCmd` configuration value.

--header-cmd=<command>::
	Specify a command that is executed once per outgoing message
	and output RFC 2822 style header lines to be inserted into
	them. When the `sendemail.headerCmd` configuration variable is
	set, its value is always used. When --header-cmd is provided
	at the command line, its value takes precedence over the
	`sendemail.headerCmd` configuration variable.

--no-header-cmd::
	Disable any header command in use.

--[no-]chain-reply-to::
	If this is set, each email will be sent as a reply to the previous
	email sent.  If disabled with "--no-chain-reply-to", all emails after
	the first will be sent as replies to the first email sent.  When using
	this, it is recommended that the first file given be an overview of the
	entire patch series. Disabled by default, but the `sendemail.chainReplyTo`
	configuration variable can be used to enable it.

--identity=<identity>::
	A configuration identity. When given, causes values in the
	'sendemail.<identity>' subsection to take precedence over
	values in the 'sendemail' section. The default identity is
	the value of `sendemail.identity`.

--[no-]signed-off-by-cc::
	If this is set, add emails found in the `Signed-off-by` trailer or Cc: lines to the
	cc list. Default is the value of `sendemail.signedOffByCc` configuration
	value; if that is unspecified, default to --signed-off-by-cc.

--[no-]cc-cover::
	If this is set, emails found in Cc: headers in the first patch of
	the series (typically the cover letter) are added to the cc list
	for each email set. Default is the value of 'sendemail.ccCover'
	configuration value; if that is unspecified, default to --no-cc-cover.

--[no-]to-cover::
	If this is set, emails found in To: headers in the first patch of
	the series (typically the cover letter) are added to the to list
	for each email set. Default is the value of 'sendemail.toCover'
	configuration value; if that is unspecified, default to --no-to-cover.

--suppress-cc=<category>::
	Specify an additional category of recipients to suppress the
	auto-cc of:
+
--
- 'author' will avoid including the patch author.
- 'self' will avoid including the sender.
- 'cc' will avoid including anyone mentioned in Cc lines in the patch header
  except for self (use 'self' for that).
- 'bodycc' will avoid including anyone mentioned in Cc lines in the
  patch body (commit message) except