--- The message cannot be delivered to the following address. ---
email@example.com Mailbox unknown or not accepting mail.
501 Invalid recipient address (no such address at this site)
Diagnostic-Code: X-Notes; Cannot route mail to user (firstname.lastname@example.org).
--- Begin Message ---
Here is the file.
File attachment: your_letter.pif
The file attached to this email was removed
because the file name is not allowed.
--- End Message ---