Sending mails using Postfix gives the error "Host or domain name not found"

Solution Verified - Updated -

Issue

  • Postfix is unable to resolve the host/domain, in spite of having the entries in /etc/hosts
  • While sending, it gives the following error:
to=<user@example.com>, relay=none, delay=0.55, delays=0.13/0.04/0.38/0, dsn=4.4.3, status=deferred (Host or domain name not found. Name service error for name=smtp.example.net type=A: Host not found, try again)

Environment

  • Red Hat Enterprise Linux [All versions]

Subscriber exclusive content

A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more.

Current Customers and Partners

Log in for full access

Log In

New to Red Hat?

Learn more about Red Hat subscriptions

Using a Red Hat product through a public cloud?

How to access this content