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Using exim4 with fetchmail warning - Debian

Hi, I've just found that the default exim4 configuration (exim4 4.20-1 deb package) comes with no smtp_accept_queue_per_connection value. So exim4 default, which is 10, is taken as a value. So if you have a dialup connection, and fectchmail retrieves more that 10 messages in one smtp connection, then exim4 will kindly deliver the first 10 messages, and the store the rest of them in /var/spool/exim4/input/ To deliver this "lost" messages, use exim4 -ql So you should set smtp_accept_queue_per_connection to a higher value if you are in this case (I use 1000). I did put this in /etc/exim4/conf.d/main/02_exim4-config_options. The risk, as ...

  1. #1

    Default Using exim4 with fetchmail warning

    Hi,

    I've just found that the default exim4 configuration (exim4 4.20-1 deb
    package) comes with no smtp_accept_queue_per_connection value.

    So exim4 default, which is 10, is taken as a value. So if you have a
    dialup connection, and fectchmail retrieves more that 10 messages in one
    smtp connection, then exim4 will kindly deliver the first 10 messages,
    and the store the rest of them in /var/spool/exim4/input/

    To deliver this "lost" messages, use exim4 -ql

    So you should set smtp_accept_queue_per_connection to a higher value if
    you are in this case (I use 1000). I did put this in
    /etc/exim4/conf.d/main/02_exim4-config_options.

    The risk, as I understand it, is a deny of service attack... but if it's
    a dialup machine, I guess it's no big deal. Another way would be to run
    a script with exim4 -ql on a regular basis.

    I hope this will save some of you the loss of some maybe important or
    urgent messages.... Maybe a warning could be put in debian's package doc ?

    Best regards to all debianers,

    Franck Routier



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  2. #2

    Default Re: Using exim4 with fetchmail warning

    -----BEGIN PGP SIGNED MESSAGE-----
    Hash: SHA1

    On Wed, Jul 23, 2003 at 11:53:18AM +0200, franck routier wrote:
    > The risk, as I understand it, is a deny of service attack... but if it's
    > a dialup machine, I guess it's no big deal. Another way would be to run
    > a script with exim4 -ql on a regular basis.
    Isn't that what exim's entries in crontab do? Just give it another 10
    minutes and the rest will get spit up.

    - --
    .''`. Paul Johnson <balooursine.ca>
    : :' : proud Debian admin and user
    `. `'`
    `- Debian - when you have better things to do than fix a system
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    =5RGh
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