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Two WAN connections, sendings mail via SMTP fails

Benedikt Huss

Hi,

until last week, we used to have one main WAN connection (120 Mbit/s) and a second WAN connection (20 MBit/s) which was configured to become active in case of connection errors for our main connection. We had no problems sending mails using an external mail server (we don't have any mail servers inside our local network). 

Last week our second connection was upgraded to 100 Mbit/s and we decided to use both connection simultaneously. As soon as the second connection is active, sending mails via SMTP fails (our NAS is not able to send a mail, I only get an error code). I tried to create a multipath rule for SMTP, but that did not seem to help.

Any idea whats wrong there?

Regards,

Benedikt



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