> <div class="moz-text-flowed" style="font-family: -moz-fixed">OPTITAS > Info wrote: >> Environment (all servers running Debian etch w exim4 and latest >> patches applied). >> Both Linux-Servers are running FWBuilder iptable firewalls. >> >> Scenario sending a mail from the WXP PC: >> * WindowsXP-PC w Thunderbird (eMail source) >> -> MailServer1 (gateway, smart router, connected via DSL Router) >> -> MailsServer2 (relay, outgoing eMail) sending emails to the final >> destination. >> Anything works fine until large eMails (or eMail w large attachments / >> approx > 1MB) are sent. >> Whenever large email are sent, the connection once is broken and the >> sending host (Server1) retries sending the emails on next >> queue-run. >>> From the exim log of Server1: >> "R=smart_route T=remote_smtp defer (-46): SMTP error from remote mail >> server after end of data: host xx.xx.xx.xx [xx.xx.xx.xx]: 421 >> adomain.eu SMTP incoming data timeout - closing connection" >> >> I did some investigation a few weeks ago and found out that after a >> while fragmented packets are sent over the Internet line. I >> tried some "optimized" MTU settings but could not solve the problem. I >> do not think it's a problem with the MTU. >> >> Regardless of the problems sending large mail from Server1 to the >> internet, receiving large eMails is not a problem. >> >> Any help appreciated. >> >> > > Sounds as if the two LinBoxen involved are under your control. Yes.
> > If so, what happens when you scp or ftp comparable sized files between > them over the same links & via the same firewalls (if any)? > > My guess is that it is trouble-free. You are right! > > I suspect you need to be looking at MUA <-> MSA <-> MTA handshakes and > timeouts more than MTU sizes. Could you pls. tell me which timeouts - related to the exim configs - need to be changed? Regrads Tilman > > JFWIW, we limit to 800 MB - enough to handle a full CD plus transmittal > notes. > > Initially, we did have to adjust time-outs ELSE sender's MUA was unaware > it had suceeded, made multiple successive deliveries. > > Attachments of several MB are common, and no trouble. > > CAVEATS: *BSD servers, ABM desktops, SeaMonkey MUA. > > > HTH, > > Bill Hacker > > > > </div> > -- ## List details at http://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
