I am a newbie to linux, detailed explanation would be appreciated.
I configured Qmail MAIL on Fedora core 4 server and the same is acting as Internet proxy server too.
Mail server role is to serve the local mails POP3 and SMTP to Intranet (i.e. mydomain.com) and forward Outgoing mail (i.e. all other mails) to email ISP and download the mails through fetch-mail service from same ISP.
I have got Two NIC one (Eth0) is configured to Local LAN and other (Eth1) is configured to DSL router connecting to 1Mbps broadband.
Now if the internet is down or slow on Eth1 the Local emails on LAN side also not processing. The mail server is not accepting the incoming mails if the internet is down. Emails will stuck in OUTBOX of Email client (Microsoft Outlook in a client machine).
The little more interesting thing is if I down the Eth1(WAN side) [ #ifdown eth1 ] then the local mails(i.e. for mydomain.com) are processing and delivering locally.
Also if I send to outside mail account for ex: to yahoo, its queuing as expected.
And If the Eth1 is also up and Internet is down from the ISP side Q-mail server is not working.
How should I address to solve this issue……
Thanks in Advance.