Unable to receive the mail notification from VC.

Products

• VMware vCenter Server

Issue/Introduction

Unable to receive the mail notification from VC even after SMTP configuration.

Environment

VMware vCenter Server.

Cause

 

• This issue can occur  If DNS records  not found in the name server which is added to VC & The nameserver is always returning `SERVER FAIL` for the lookups.

Resolution

• • Make sure there is `[]` around the smtp address.
       - This is required because we were unable to add the DNS records in the name server added to VC.
  • In /etc/nsswitch.conf file we moved the `resolv` param for the `hosts:` key to the last.
  • This is required because the nameserver is always returning `SERVER FAIL` for the lookups.
  • reload the configurations using the below commands:

 

systemctl daemon-reload
systemctl restart sendmail

 

• • Dumped the dnsmasq cache and reload it using the below command :

 

kill -USR1 $(pgrep dnsmasq)

 

• • This was needed so the next lookup will be fresh.
  • Triggered manual mail after the changes should be Successful.