On Mon, Feb 28, 2005 at 05:11:09PM -0600, David Bogen wrote:
> Since I had trouble finding the source of the problem, I decided to try
> ipfilter 4.1.6 on the off chance that some unrelated change had solved
> my problem.
>
> No dice. Messages with even small attachments were still blocked.
>
> Then, without changing anything else, I re-installed 3.4.35.
>
> Messages started flowing through the system once again.
>
> So, whatever is causing undesirable interference with postfix seems to
> be lurking in the 4.1.x branch of ipfilter, and not the 3.4.x branch.
>
Apart from MTU, the other packet size related issues (messages with
attachments) could be in the TCP window scaling code. Is 4.1.x known to
have all the i's dotted and t's crossed when handling the wscale option?
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