I've problem rececing email larger than ~ 40k from a particular sender domain.
SMTP connection from (host) [IP] lost while reading message data
they said they 've no problems sending things to ALL others. While I have no problems receiving (way)larger email from others.
I've put them in white list, does not help.
I'm suggested to perform a TCP Dump on the public interface, how can I do that? Where can i find related documentations? I'm not familiar with Linux.
I'm using V4.023
I've heard that V5 've the tools included, is that true?
Anyway, I can't upgrade it to V5 as the office is going to move soon, so my boss doesn't want to make things complicated.
Thanks in advance.
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