Not getting all our mail?

[FrankCouture]

We are only getting some mail from outside our organisation. some messages are delivered fine. others are bounced back with NDR 4.4.7. Anyone got any ideas??
Running Exchange 2000 (SBS) I have tried sending into this server from various outside sources. some work fine some dont? Could it be a DNS issue? Exchange Config Issue?

Thanks

 

[brontosaurus]

that error is an indication of congestion problems on the receiving side. nothing really you can do...

 

[paulha]

Check with your ISP that they have configured reverse lookup for you

Cheers

Paul

 

[FrankCouture]

There are only 20 users on this server. It is not overworked. I will check the reverse lookup.

Thanks

 

[leploep]

I think the problem is at the sending server, because i'm having the same problems but the thing is I AM the sending server

Have you tried a telnet on port 25 to the sending server?
Could you please paste the answer you get from that server here?

 

[FrankCouture]

I can telnet to port 25 from both sides. but I cannot send from company 2 to company 1. Company 1 can send and receives some mail (not all) company 2 can send and receive everywhere except to company 1???

I think it is DNS. I still have to check with the ISP.