Since last Wednesday, we have started to get rejected emails to a specific email account (which should be forwarded to the 'catch-all' account).  This has been fine until last week.

The error message in the rejections is:  host mx.zoho.com[165.254.167.50] said: 552 5.1.1 < user@domain.co.uk> Mailbox delivery failure policy error (in reply to RCPT TO command)

I see that others have reported similar issues, but not all of them have been resolved.  Are the rejections all due to the changes made by Zoho to the anti-spam processing?  And if so, has this change been reversed for all mailboxes, or only those who report problems?

Thanks.

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< user@domain.co.uk>: host  mx.zoho.com[165.254.167.50] said: 552 5.1.1
   < user@domain.co.uk > Mailbox delivery failure policy error (in reply to  RCPT TO command)

Reporting-MTA: dns;  server.co.uk
X-Postfix-Queue-ID: 282FA170B800
X-Postfix-Sender: rfc822;  admin@domain.org
Arrival-Date: Wed,  6 Apr 2016 03:22:44 +0100 (BST)

Final-Recipient: rfc822;  user@domain.co.uk
Original-Recipient: rfc822; user@ domain .co.uk

Action: failed

Status: 5.1.1

Remote-MTA: dns;   mx.zoho.com

Diagnostic-Code: smtp; 552 5.1.1 < user@domain.co.uk > Mailbox delivery failure  policy error