Slow mail sending

It takes about 15-30 seconds just to connect to my mailserver to send email. I'm using H-Sphere control panel, RedHat 7.2 and qmail on this box. I've tested the mail sending using Eudora and Outlook Express.

Does anyone know what might have caused this slowness and how to fix it?

The problem worse before, checking/receiving mails took a few minutes. My host said that's a reverse dns problem and when they fixed it, checking mails are lightning fast now as it should be. It's just sending mails that are still slow now.

 

 

 

 

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