DNS Forwarding loop

Friday took the prize for the “weirdest issue of the week” for this last week, which is funny for me since like most people Mondays are usually the day I dread. Or any day (night) when I happen to be on-call. It was simple enough and wacky enough to make...

BARRACUDA NETWORKS ESS INTERNAL MAIL ROUTING – RELOADED

When my customer was trying to email an external domain, they would receive an NDR with the error below. Inbound messages from that domain were being received by my customer without an issue. 550 5.7.51 TenantInboundAttribution; There is a partner connector configured...

Barracuda Networks ESS Internal Mail Routing

I ran into an email delivery issue the other day that seems likely to come up here and there. My customer could receive email inbound from a domain of a vendor they do business with, but suddenly could no longer send messages to them outbound. All I had to go on was...

Any Common Sense?

SME (SONY Music Entertainment, Inc.) does it again. Those brave soldiers of greed have once again set forth on the field of battle to save the world from another bit of free enjoyment. Let me clarify one thing – I am a capitalist. The 99% Occupy Wallstreet types out...

Etherchannel/LAG Dell VRTX & Cisco Catalyst Switch

If you read my previous Kaboom post, you may be wondering why I decided to post on another Dell VRTX. Well, the fact is I’ve still got a few of these out in the field, so they remain relevant to me. This is a another customer’s deployment and I just upgraded them from...