DSN 4.2.1 example

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Your message did not reach some or all of the intended recipients.

Subject: RE: <original subject line> Sent: M/D/YYYY H:MM PM The following recipient(s) could not be reached: recipient@receivingdomain.tld on M/D/YYYY H:MM PM The message reached the recipient's e-mail system, but delivery was refused. Attempt to resend the message. If it still fails, contact your system administrator. <server.sendingdomain.tld¹ #4.2.1² smtp;550 4.2.1³ mailbox temporarily disabled: recipient@receivingdomain.tld⁴>

Everything in the Delivery Status Notification (DSN) message is MTA-specific boilerplate, except for what is enclosed in angle brackets:

server.sendingdomain.tld
The server sending the DSN message.
#4.2.1
The three sub-code Extended SMTP Status Code.
smtp;550 4.2.1
The server SMTP Status Code reply, with an appended Extended SMTP Status Code of the message status.
mailbox temporarily disabled: recipient@receivingdomain.tld
The verbose status message to supplement the single SMTP Status Code.