How to Install Sendmail Server Installing sendmail Server Debian

i was trying to install sendmail with apt-get install sendmail but i got an error that needed some dependencies. so i send this command:

then after it was completed, i was able to send this command again and it worked

but for some reason i got these two warnings:

on this one i jus said Yes

   If your original static resolver configuration file (/etc/resolv.conf) contains nameserver addresses then those      �

 � addresses should be listed on "dns-nameservers" lines in /etc/network/interfaces as described in the README. Until   �

 � you have modified /etc/network/interfaces and reconfigured the affected interfaces resolvconf will not include       �

 � those addresses in the dynamically generated resolver configuration file. Without those addresses you may have       �

 � trouble resolving domain names. A TEMPORARY solution is to append the whole original resolver configuration file to  �

 � the end of the dynamically generated file. This will be done if there is a symbolic link from                        �

 � /etc/resolvconf/resolv.conf.d/tail to /etc/resolvconf/resolv.conf.d/original. If you agree then this symbolic link   �

 � will be created, provided that no /etc/resolvconf/resolv.conf.d/tail already exists.                                 �

 �                                                                                                                      �

 � After you have modified /etc/network/interfaces to add the required "dns-nameservers" lines you should point the     �

 � /etc/resolvconf/resolv.conf.d/tail symbolic link to /dev/null.                                                       �

 �                                                                                                                      �

 � Append original file to dynamic file?                                                                                �

 �                                                                                                                      �

 �                                                                          

on this one i jus said OK

   ������������������������������������������� Configuring resolvconf    ������������������������������������������������

  �                                                                                                                     �

  � Remember to reconfigure network interfaces                                                                          �

  �                                                                                                                     �

  � Once resolvconf is installed, interface configurers supply nameserver information to it (which it then makes        �

  � available to the C Library resolver and to DNS caches). However, they do this only when they bring up interfaces.   �

  � Therefore for resolvconf's nameserver information to be up to date after initial installation it is necessary to    �

  � reconfigure interfaces -- that is, to take them down and then to bring them up again -- and to restart DNS caches.  �

  �                                                                                                                     �

  �