[sendmail] How avoid the reverse DNS check?

["Davi Leal" <david.leal@ene.es>]

sendmail 8.12.2-5

When sending mail to the server, there is a 25 second delay before the sent
mail is accepted. It is due to the reverse DNS check. How to disable the
reverse DNS check?. Any FEATURE, #define, etc. to the sendmail.mc file?. Any
option to the sendmail.cf file?. Any idea?

Regards,
Davi Leal