Each string in each field treated as if they are email addresses to be emailed to

Has anyone experienced this?
There are several forms on my site, and they all now follow the same behavior, with every string in every field attempting to be emailed to.

If I input my occupation as "dish washer". An attempt is made to mail the submitted values to dish@foo.com and washer@foo.com. The intended recipient (Webform mail settings --> E-mail to address) receives the submission fine.

I am trying to pin down where this issue is originating, as I have never had webform behave in such a manner.
I do not have all fields set to have conditional recipients.

I am attaching the email log and the failure notice.

Any ideas greatly appreciated.

//// mail log ///
2009-12-12 14:49:43.306752500 new msg 19497654
2009-12-12 14:49:43.306753500 info msg 19497654: bytes 1052 from qp 23436 uid 3797
2009-12-12 14:49:43.397922500 bounce msg 19497654 qp 23492
2009-12-12 14:49:43.397923500 end msg 19497654
2009-12-12 14:49:43.306754500 starting delivery 2665206: msg 19497654 to local foo.com-land@foo.com
2009-12-12 14:49:43.391998500 delivery 2665206: failure: Sorry,_no_mailbox_here_by_that_name._(#5.1.1)/
2009-12-12 14:49:43.306755500 starting delivery 2665207: msg 19497654 to local foo.com-test@foo.com
2009-12-12 14:49:43.391999500 delivery 2665207: failure: Sorry,_no_mailbox_here_by_that_name._(#5.1.1)/

/////Failure notice/////
Hi. This is the qmail-send program at foo.com.
I'm afraid I wasn't able to deliver your message to the following addresses.
This is a permanent error; I've given up. Sorry it didn't work out.

:
Sorry, no mailbox here by that name. (#5.1.1)

:
Sorry, no mailbox here by that name. (#5.1.1)

:
Sorry, no mailbox here by that name. (#5.1.1)

:
Sorry, no mailbox here by that name. (#5.1.1)

:
Sorry, no mailbox here by that name. (#5.1.1)

:
Sorry, no mailbox here by that name. (#5.1.1)

:
Sorry, no mailbox here by that name. (#5.1.1)

:
Sorry, no mailbox here by that name. (#5.1.1)

--- Below this line is a copy of the message.

Return-Path:
Received: (qmail 11500 invoked by uid 3797); 12 Dec 2009 21:28:26 -0000
Date: 12 Dec 2009 21:28:26 -0000
Message-ID: <20091212212826.11498.qmail@foo.com>
To: This@foo.com, is@foo.com, a@foo.com, test@foo.com,
message.Please@foo.com, do@foo.com, not@foo.com,
respond@foo.com
Subject: Form submission from: General Manager
X-PHP-Script: www.tireworldinc.com/index.php for 213.145.98.219
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8; format=flowed; delsp=yes
Content-Transfer-Encoding: 8Bit
X-Mailer: Drupal Webform (PHP/5.2.10)
Errors-To: jen@bar.com
Sender: jen@foo.com
From: tgh@foo.com

Submitted on 12/12/2009 - 14:28
Submitted by user: test [213.145.98.219]

Submitted values are:

Name: support 74
Company: foo Ltd
Your Feedback:
This is a test message. Please do not respond.

Would you like a response?: No
Contact Preferences:
I prefer to be contacted via: Email
which is: support@foo.com

The results of this submission may be viewed
at:http://tireworldinc.server293.com/node/61/submission/15