First off, this isn't a lack of them responding. This is a mail server issue that they are likely completely unaware of.
I tried to send a stock check request for a $5400 item to Bintel a few minutes ago, but it got bounced by their email server:
554 Sending address not accepted due to spam filter
Some checking showed that this was due to their mail hosting provider attempting to real time verify my address against my mail server, however a check of my server logs shows no incoming connection from them despite several other active SMTP sessions at that time. Packet capture on the external interface of my firewall verfied this. Additionally, I did an RBL check of my IP just to make sure I was kosher, and came up negative on all RBL lists checked (around 50). I also have valid spf records for the sending domain in question.
Is anyone else having difficulty in sending Bintel email? I suspect that their email host, Postini (psmtp.com) is either having issues with a server or needs a swift kick to the nether regions.
It is costing Bintel money, so it is really in their best interest to look into it.
I guess I'll just have to fall back to using the telephone if I can be bothered. Ick 