[Mimedefang] md_check_against_smtp_server() returned an empty response

[Steffen Kaiser]

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On Wed, 27 Mar 2013, Richard Laager wrote:

> I'm troubleshooting an issue where md_check_against_smtp_server()
> intermittently hangs for 5 minutes. It's *always* 300 seconds exactly
> (ignoring sub-second precision).
>
> I'm using this function for doing callbacks against the sender's
> address. I look up the MX records using Net::DNS. Before you hate me too

:-|

> Does anyone have any idea why the 15 second IO::Socket::INET timeout
> isn't applying in these cases?

tar-pitting? IMHO, the timeout kicks in when there are no TCP alive 
packets. But when the other partner sends keep alive packets, but does not 
respond simply.

- -- 
Steffen Kaiser
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