Add SMTP HELO/EHLO delay
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Add SMTP HELO/EHLO delay
Hi,
Unless I've missed it, is it possible to add an SMTP HELO/EHLO delay?
Thanks,
Chris.
Unless I've missed it, is it possible to add an SMTP HELO/EHLO delay?
Thanks,
Chris.
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Just a simple option to add a delay.glendale2x wrote:Are you just looking for an option to add a delay in responding to HELO/EHLO, or something more complex?
Any idea if this will be easy to implement and if so, when it could possibly be available?
I use it on my primary mail server and find a lot of SPAM bots give up if they don't get an instant response
Although, Tarpitting will be a 'nice to have' in the future.
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A configuration option for "HELO/EHLO Response Delay" has been added to the account control center. It can be found under a new "Advanced Options" section in the mail domain settings, which can be accessed by clicking on a domain name in the mail services section.
This feature is not yet active in the filter core, but you can configure the settings now and they will take effect with the next filter core upgrade.
This feature is not yet active in the filter core, but you can configure the settings now and they will take effect with the next filter core upgrade.
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Roller Network LLC
Roller Network LLC
Superb, thanks glendale2x for looking into that and setting it up so promptly! It's a great feature and will hopefully reduce SPAM to your servers! Any idea when the new filter core upgrade is planned?
Also, any further news on setting up a higher level fake MX record?
Also, any further news on setting up a higher level fake MX record?
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Well, we're still trying to work out a final bug... the problem is that we don't know what filter settings to apply until we get a recipient address, and HELO comes before that. We could proxy buffer incoming connections, but that only works for non-TLS sessions. We can, quite easily, introduce a delay after each (or first only, or make it an option to delay first or all) RCPT TO command, if that's an acceptable substitute.
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Roller Network LLC
Roller Network LLC
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Well, we can't do it with the current way our content filter works. We might be able to do it with the Postfix Milter-style interface, but that'll take some work to do. (Postfix 2.3 added milter support; we've been using 2.2 until recently.) We're looking at the Milter interface for other reasons, such as less resource usage, so if it's possible we'll do it.
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Roller Network LLC
Roller Network LLC