Hi
I have SuSE-11.1 with mailman and sendmail. From the mailman installation manual I learn that:
One of the surest performance killers for Sendmail users is when Sendmail is configured to synchronously verify the recipient’s host via DNS. If it does this for messages posted to it from Mailman, you will get horrible performance. Since Mailman usually connects via localhost (i.e. 127.0.0.1) to the SMTP port of Sendmail, you should be sure to configure Sendmail /not/ to do DNS verification synchronously for localhost connections.
Questions: How can I verify whether my sendmail does those DNS lookups on connections to 127.0.0.1 and - if it does - how can I turn it off in the sendmail.cf file?