What type of messages will organizations receive when using SMTP relay with a default From Address?

When organizations use SMTP relay with a default From Address, they will primarily receive bounce-back messages. A bounce-back message occurs when an email cannot be delivered to the intended recipient and is returned to the sender. This can happen for various reasons, such as invalid email addresses, the recipient's inbox being full, or issues with the recipient's mail server.

The default From Address may not always correspond to an actual user in the recipient's email system, which can increase the likelihood of emails being treated as spam or undeletable. Therefore, when recipients' mail systems cannot process the emails sent from a generic or non-existent address, the messages are bounced back to the sender. This scenario emphasizes the importance of configuring email settings properly to ensure better deliverability and to reduce the volume of bounce-back messages.

While error messages generally indicate problems encountered during the transmission of an email, notification messages typically convey general updates, and confirmation messages confirm that an email has been sent successfully. In the context of SMTP relay with a default From Address, the predominant outcome is the receipt of bounce-back messages due to the issues mentioned.