Update Domain

The Domain ID.

Track clicks within the body of each HTML email.

Track the open rate of each email.

• opportunistic: Opportunistic TLS means that it always attempts to make a secure connection to the receiving mail server. If it can’t establish a secure connection, it sends the message unencrypted.

• enforced: Enforced TLS on the other hand, requires that the email communication must use TLS no matter what. If the receiving server does not support TLS, the email will not be sent.