Add a Signature to Every WordPress Email
Appends a short signature, such as your company name, address and support link, to the bottom of every email the site sends, in both plain-text and HTML emails.
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Descriptions Under Shipping Methods
Prints a short explanation under each shipping option at checkout, such as delivery times or "signature required", so customers know what they are choosing.
Sign Outgoing Emails With DKIM
Adds a DKIM signature to every email using a private key file and settings stored in wp-config.php, so receiving servers can verify your messages.