Rocco Scappatura:
> Oct 29 10:27:58 av3 postfix/smtpd[16988]: connect from
> unknown[xxx.yyy.www.zzz]
> Oct 29 10:27:58 av3 postfix/smtpd[16988]: 7B98D75008D:
> client=unknown[xxx.yyy.www.zzz]
> Oct 29 10:34:25 av3 postfix/smtpd[16988]: timeout after DATA from
> unknown[xxx.yyy.www.zzz]
> Oct 29 10:34:25 av3 postfix/smtpd[16988]: disconnect from
> unknown[xxx.yyy.www.zzz]
>
> What I can suspect about the cause? Firewall, Protection software on
> sending client or what?
All of the above, including firewalls that break IP path MTU
discovery or TCP window scaling. A tcpdump recording will
help to distinguish between these. I don't think that packet
content is needed for this.
Wietse
