Hi, enabling TLS on your postfix server is quite simple. Only enable it using following lines in your main.cf config file (usually /etc/postfix/main.cf):

• smtpd_use_tls = yes (enable the TLS usage)
• smtpd_tls_cert_file = /etc/pki/tls/certs/yourcertificate.crt (set your server certificate file)
• smtpd_tls_key_file = /etc/pki/tls/private/yourkey.key (set your server key file)
• smtpd_tls_loglevel = 1 (enable TLS logging*)
• smtpd_tls_security = may (set TLS security level*)
• smtpd_tls_received_header = yes (write TLS status to email header)

​*) TLS logging:
this setting's values are different in postfix v2.9 and later. for example in postfix 2.9+ the TLS handshake is logged even if the value is 0. On the other hand you need to set the value to 1 in postfix earlier to 2.9.

*) TLS security level:
may – if there is an encryption available it will be used
encrypt – means enforce the encryption. Any connection without TLS is refused

you can find more infos on the postfix website.

You can find all VMware Tools packages on

https://packages.vmware.com/tools/esx/index.html

They provide an .exe and .iso file for windows and package repositories for different linux distributions like RHEL, CentOS, SuSE or Ubuntu.

Here an example how to setup a package repository for ESXi 4.1 and CentOS5:

• create a repo file
  # touch /etc/yum.repos.d/vmware-tools.repo
• then open it
  # vim /etc/yum.repos.d/vmware-tools.repo
• and paste following text inside:
  [VMWare-tools]
  name=VMWare Tools Packages for Enterprise Linux 5 – $basearch
  baseurl=https://packages.vmware.com/tools/esx/4.1latest/rhel5/$basearch
  enabled=1
  gpgcheck=0
• save it and close the file.
• now you can install the vmware-tools (desktop) or vmware-tools-nox (server) package.
• after install reboot the computer

​replace inside the baseurl "4.1latest" with your esxi version and "rhel5" with your os version.