I am having a very bad week.... Exchange 2003 problems now!

[indiegirl]

Our Exchange 2k3 server's not playing ball... well, it hasn't since yesterday afternoon. I've made no changes, nor has the NM, but suddenly all outbound mail is sat in the queue not sending.

Internal mail works fine, and we can get mail from outside-in, but not send inside to outside.

The queue complains that "destination server does not exist", however we've verified with our ISP that it does and that their server's up.

I'm thinking that it's to do with the connection between our mail server and the ISP's, has anyone seen this before and what else could I check?

[E1uSiV3]

Have you checked your DNS server and forwarders are working properly?

[GrumbleDook]

do you route your mail through a filter? check the DNS on that box too if you do.

[indiegirl]

*goes off to look*

Hmmm, DNS settings checked and verified, now getting "unable to bind to the destination server in DNS"

So, definitely a DNS error... uggghhh, I hate DNS....

[Ric_]

Do you use a smarthost? If so, check that you can see the smarthost.

Also check that nobody has bolloxed up the settings on the smarthost so that it is not relaying your mail.

[m25man]

On the DNS front,
if you are using your own ISP (not your RBC) BT decided to change its DNS Server IP addresses this week and a number of systems have fallen over as a result.

If your using DNS forwarders check they have valid data.

Geoff