Can something be done about this? Does it have to do something with the fact that there was a zip file attachment?
This was what my friend (on Gmail) got back:
Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 554 554 5.2.3 MailPolicy violation Error delivering to mailboxes (state 18).
I seem to be receiving other messages fine, or so I think.
Please let me know ASAP because I might be losing mails :(