Download and Verifying the Open Source Distribution Package.

For Exp Source Package: Sendmail

To download latest source code distribution, find a local mirror located near to you from www.sendmail.org/mirrors.html, and use wget to download the latest version of the sendmail program source code.

[root@redhat~]$ wget ftp://ftp.sendmail.org/pub/sendmail/sendmail.8.13.4.tar.gz

From the sendmail web site, we are given the MD5 signatures of the source tarballs, so use the md5sum command to verify the integrity of the download.

[root@redhat~]$md5sum sendmail.8.13.4.tar.gz

--------------------------------------------------------
61e336750b48b01abaa69b4d7c9473b5 sendmail.8.13.4.tar.gz
--------------------------------------------------------

if the signatures calculated by md5sum matches the signature published on the Sendmail Consortium web site, then you have a good download. Otherwise, delete the file, and retry from another mirror.