Exim Problem Help Me!! Very Slow Sending!

[bsasninja]

Exim was working ok and yesterday began to work very slow when it sends messages.
In outlook express an empty mail takes 35 seconds to send it.
Also when i use a mailing sofware for sending a newsletter tooks a lot of time.

Whats going on?? Please help!!!!!!!!!!!!!!!!!!!!!!

 

[AndyReed]

Is the server load very high? How many messages are there in the queue? Is your server under DOS attack? There are many variables involved in slowing down a service on the server.

 

[chirpy]

Indeed. You should also check that DNS resolution is working correctly on the server and that you haven't enabled any onerous tweaks in /etc/sysctl.conf (or APF if you use it) which can badly affect SMTP. Could just as easily be your network connection.

 

[bsasninja]

Clue

I have other exim running on port 8025, when I send e-mails through this port they go like a missile, but in port 25 pass 30 seconds to send a message.

I will check sending from other ISP than the one Im using to discard that they are not blocking or doing some kind of filtering to that port.

Thanks for your replies guys! :D

 

[asiams]

email sending very slow here.

My server is not sending emails fast. It takes long time to send a simple email.

The CPU is not too high. A couple of hundreds of emails were on the queue, but even after the emails are cleared from the queue, the situation does not change.

How can I check whether I am under DOS attack?

How can I check that DNS resolution is working correctly on the server?

In my /etc/sysctl.conf, here is the list I have:

# Controls IP packet forwarding
net.ipv4.ip_forward = 0

# Controls source route verification
net.ipv4.conf.default.rp_filter = 1

# Do not accept source routing
net.ipv4.conf.default.accept_source_route = 0

# Controls the System Request debugging functionality of the kernel
kernel.sysrq = 0

# Controls whether core dumps will append the PID to the core filename.
# Useful for debugging multi-threaded applications.
kernel.core_uses_pid = 1

Would any of the function above cause the problem?

Any help would be greatly appreciated.

Abraham Lee