Hi,I have a mail server in a company network that tries to connect my exim smart host. The company has a very slow internet connection and needs to send some quite big messages (10-20 MB). Transferring one of these messages should take about 15-20 minutes by their upload speed.
However these big messages rarely get delivered. In Exim's log I see many messages like this one: "SMTP connection from <host> (<internal name>) [<ip>] lost while reading message data"
On the Exim side I don't do any special blocking and the messages do not hit size restrictions for sure, smaller messages get through without problems.
I don't think there is some kind of MTU problem (my servers are in 'reasonable' data centers and I don't block ICMP) I tried sending a big message from the company server to another email provider and that seemed to work without problems. I tried using another Exim smarthost located in a different data center but same the same problems as described above. I used tcpdump on my Exim server and it looked like the complete message was being transferred but before Exim acknowledged successful message reception, the connection was dropped (I could not detect in wireshark what did cause this - any hints welcome).
Therefore I guess it's some kind of timeout on my Exim's side.Any hints what to try next? Can I configure Exim timeouts that may influence it's behavior?
fs
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