Sendmail is deferring mail

[Erik Max Francis]

Sandeep Gupta wrote:

> I'm running Redhat Linux 7.2 and sendmail 8.11.6.
> 
> I'm sending mail via python 2.2's smtplib library.  After the python
> application is complete, I did a "mailq" and got the following:
	...
> Any ideas about why my mail is being deferred?

Python is out of the picture once the mail is sent; your problem doesn't
have anything to do with Python.

A deferred message means that sendmail (not Python) is having some
difficulty trying to deliver the mail.  The "host map: lookup" message
suggests that the problem is that MX records for the domain in question
are not resolving; check to see if DNS is set up properly on the machine
which is running sendmail.

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