Someone sent me an email and it was returned to them with a 554 mail server permanently rejected message message. Why did this happen?
This only happens when the sender of the message is sending from an IP address that is listed on an IP blacklist. Often this is the result of the sender using an IP address that has previously been used by a spammer, or the content of the incoming message has "spam-like" words.
The proper way to get this fixed is to ask the sending to contact their ISP and let them know of the issue - they should also forward their ISP the bounce message that our servers sent them.
However, in order to expedite receipt of their messages you can also send us an email to support@brownrice.com and ask us to "whitelist" the senders address and this will never happen again.