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me and some of my customers are experiencing a strange situation using Thunderbird client and kerio smtp with authentication.
No matter the size of the message thunderbird takes like 10 seconds to send mails using my kerio mailserver smtp with authentication.
This long delay disappear if I just set an "allow" rule from my IP.
This delay happens also with Outlook express and other clients.
It looks like KMS takes a lot of time to authenticate a user.

Does anybody have noticed this situation?


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That sounds like the "Spam Repellent" feature. The SMTP greeting delay applies to all incoming SMTP connections since it has no way to know if the incoming connection will eventually authenticate or not.


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Yes this sounds like the spam repellent. It is often set to 20 seconds and can apply to all clients.

There is an option to Not Apply to Internal clients (network address range).

Take spam repellent off or better still just don't apply to your internal clients.

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you guys were all right.
I tried to disable "spam repellent" and the problem went away.
My KMS is on an online server outside from my internal network and last week we changed our public IP. Since i forgot to add my new Ip to the "allow list" I started experiencing the delay.

Maybe it can't be in other way but actually this is a little annoyance for customers not using a static IP.
There should be a trick .. like "don't care about SMTP greeting delay if it's using SSL" or whatever ..
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