MailSettings

is an option for SendMail and MailServerConnect to specify mail settings.

Details

On desktop systems, SendMail requires certain user mail settings. These can be defined through Preferences ▶ Internet & Mail ▶ Mail Settings in the notebook front end or by using SetOptions[SendMail,MailSettings]. SendMail will attempt to send email via the Wolfram Cloud if these settings have not been provided.
MailSettings is an association with the following keys:

"AutoBcc"	None	automatic hidden recipients
"AutoCc"	None	automatic secondary recipients
"EncryptionProtocol"	None	email encryption protocol
"FromAddress"	Automatic	sender's email address
"FromName"	None	sender's full name
"Password"	Automatic	user password
"PortNumber"	Automatic	server port number or numbers
"ReplyTo"	None	suggested address for replies
"Server"	Automatic	server host name or IP address
"IncomingMailServer"	None	incoming mail server settings
"ServerAuthentication"	Automatic	whether and how to verify server certificates
"Signature"	None	text to be appended at the end of email body
"Username"	$Username	user login name
"MailFolderName"	"INBOX"	default mail folder for mail server connection

Possible settings for "EncryptionProtocol" include "SSL", "StartTLS", "TLS", and None.
"Password" is typically set to None if no password authentication is required, or to Automatic if the password is to be entered in an interactive dialog. The password can also be given as a plain text string.
Email credentials can be optionally stored via the "Password" interactive dialog. The credentials are encrypted using keys stored on your computer's hard drive. The encrypted credentials will be transmitted to the Wolfram Cloud and may only be accessed after you have authenticated using your Wolfram ID.

Add a signature to an email:

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