Xaver Aerni wrote:
Hello since 4 days. Has many costumer of higspeed a
problem to sending
The Mail will be deliverd till 12 hour after sending.
When a client sending from hispeed to gmail or hispeed to other
Mailserver on the CC or aorta Network it will be transmitted 1 till 2
hour later. Normaly it should be delivered in some seconds.
This problem is since 4 days. I think is a routing Problem...
Traceroute, wireshark/tcpdump are your friends...
Not forgetting about the logs of the mail servers involved of course
(depending on which part you can lay your hands on) and checking if
reverse DNS is actually properly working.