On 9/8/2013 2:38 PM, Anurag Bhatia wrote:

Hi Matthew

Interesting experience.

...

first into a black hole, and then bouncing with permanent failures.

What you mean by permanent failures? Can you share error you saw in bounce report?

RFC 2505 Anti-Spam Recommendations February 1999

1.6. SMTP Return Codes

SMTP has several classes of Return Codes, see [1] for a discussion:

o 5xx is a Permanent Negative Completion reply (Fatal Error) and results in the mail transfer being terminated and the mail returned to sender.

-- Requiescas in pace o email Two identifying characteristics of System Administrators: Ex turpi causa non oritur actio Infallibility, and the ability to learn from their mistakes. (Adapted from Stephen Pinker)