The message with the VM error code is from VM's outbound mail servers which have blocked the sending of the mail because the VM servers with the help of the filtering provided by Cloudmark (your spam filtering partners) thinks it is spam or contains spam content.
If it has been blocked on receipt by another ISP the message would have been completely and utterly different and not had the VM 603 code attached.
Superuser 18/19. Use Kudos to say thanks Tick an answer as "helpful" only when the problem is solved Please don't send me private messages unless I ask you to. I do not work for VM. The advice I give is based on my best understanding of VM policy and practice. You rely on it at your own risk.
I am getting the same problem please tell me the finest solution for the problem. Also my soundcloud is not working very good. Crashing at random point of time.
Your problem needs to be addressed in a new thread. Please repost with the exact error message including any string of characters which identifies the exact transaction to the the forum team who can correlate the codewith their logs to see what text triggered the spam content warning.
But do be sure to delete any personal email address or suchlike.