AppleScript to send e-mail, using Apple's Mail, with multiple recipients, cc, bcc and attachments

AppleScript Mail Send.scpt

tell application "Mail"
	
	set theFrom to ""
	set theTos to {}
	set theCcs to {}
	set theBccs to {}
	
	set theSubject to ""
	set theContent to ""
	set theSignature to ""
	set theAttachments to {}
	set theDelay to 1
	
	set theMessage to make new outgoing message with properties {sender:theFrom, subject:theSubject, content:theContent, visible:false}
	tell theMessage
		repeat with theTo in theTos
			make new recipient at end of to recipients with properties {address:theTo}
		end repeat
		repeat with theCc in theCcs
			make new cc recipient at end of cc recipients with properties {address:theCc}
		end repeat
		repeat with theBcc in theBccs
			make new bcc recipient at end of bcc recipients with properties {address:theBcc}
		end repeat
		repeat with theAttachment in theAttachments
			make new attachment with properties {file name:theAttachment as alias} at after last paragraph
			delay theDelay
		end repeat
	end tell
	
	# macOS 10.12+ know bug
	# https://stackoverflow.com/questions/39860859/setting-message-signature-of-outgoing-message-using-applescript
	# set message signature of theMessage to signature theSignature
	
	send theMessage
	
end tell

With macOS 10.10 "Yosemite," AppleScript enabled the ability to write handlers with optional parameters by providing default values. This eliminates the need to pass empty or zero values for parameters that aren't actually used.

Send_Mail_Message given theSubject:"Armageddon", theContent:"Now that I have your attention…"

to Send_Mail_Message given theSender:theSender : "defaultF@fromaddress.com", theRecipients:theRecipients : {"defaultF@toaddress.com"}, theCcs:theCcs : {}, theBccs:theBccs : {}, theSubject:theSubject : "", theContent:theContent : "", theSignature:theSignature : "", theAttachments:theAttachments : {}, theDelay:theDelay : 1

	tell application "Mail"

		set theMessage to make new outgoing message with properties {sender:theSender, subject:theSubject, content:theContent, visible:false}

		tell theMessage
			repeat with theTo in theRecipients
				make new recipient at end of to recipients with properties {address:theTo}
			end repeat
			repeat with theCc in theCcs
				make new cc recipient at end of cc recipients with properties {address:theCc}
			end repeat
			repeat with theBcc in theBccs
				make new bcc recipient at end of bcc recipients with properties {address:theBcc}
			end repeat
			repeat with theAttachment in theAttachments
				make new attachment with properties {file name:theAttachment as alias} at after last paragraph
				delay theDelay
			end repeat
		end tell

		if theSignature ≠ "" then
			set message signature of theMessage to signature theSignature
		end if

		send theMessage

	end tell
	
end Send_Mail_Message