I have a problem with sendmail. it's working fine. But when the internet link is down, as dns server is not hosted locally. All mails from clients are not accepted by the sendmail server. Mails lies in the outbox of the outlook express. When internet link is up everything is fine again.

I don't see any panga due to the DNS server here. Assume that the DNS server is hosted locally, then what ? If the link is down, anyways, it will not be able to query, and hence not be able to resolve the hostnames. Those names will be possibly resolved, which are cached by your DNS server.

I want that when internet link is down mails should be accecpted by the sendmail server, and keep it in the queue and send when link is up.

Why not ? Sendmail does that. If your mailserver is sendmail, it will accept the mails and then spool them locally, till the link is up. If you have sendmail server locally, which is the only server for your domain, then possibly you have a problem, as mails won't come in when the link is down.

Can anyone suggest what i should i do. so the sendmail will accepcts mails at all point.

This seems to me as a config issue at either Outlook's side. Check your local sendmail settings.

--amar

-- Amarendra A. Godbole / Microsoft ``Services For UNIX'' / These opinions are _MINE_. You are the sum total of the choices you make.