Host unknown error response with sendmail

Hi,

sendmail tries to resolv for "every" mail

the hostname of th remote Mail-Server.

If the DNS Server is not availble I get of course the error message <Host unkown>.

Now sendmail deletes the messages

(does not send it to the queue).

Question: How can I avoid this situation, and sendmail storage the message in the queue

[384 byte] By [ThomasKopp] at [2007-11-25 23:25:03]