I keep getting this error message on a test email to myself

[01] 4/29 18:47:17 ~ Opening connection for delivery...
[01] 4/29 18:47:17 ~ Connecting to smtp.gmail.com Port:587
[01] 4/29 18:47:18 ~ Connected
[01] 4/29 18:47:18 220 mx.google.com ESMTP ff9sm22403403wib.2
[01] 4/29 18:47:18 > EHLO [192.168.0.8]
[01] 4/29 18:47:18 250-mx.google.com at your service, [2.123.249.241]
250-SIZE 35882577
250-8BITMIME
250-STARTTLS
250 ENHANCEDSTATUSCODES
[01] 4/29 18:47:18 > AUTH LOGIN
[01] 4/29 18:47:18 530 5.7.0 Must issue a STARTTLS command first. ff9sm22403403wib.2
[01] 4/29 18:47:18 > STARTTLS
[01] 4/29 18:47:18 220 2.0.0 Ready to start TLS
[01] 4/29 18:47:18 ~ Connected
[01] 4/29 18:47:18 > EHLO [192.168.0.8]
[01] 4/29 18:47:18 250-mx.google.com at your service, [2.123.249.241]
250-SIZE 35882577
250-8BITMIME
250-AUTH LOGIN PLAIN XOAUTH
250 ENHANCEDSTATUSCODES
[01] 4/29 18:47:18 > AUTH LOGIN
[01] 4/29 18:47:18 334 VXNlcm5hbWU6
[01] 4/29 18:47:18 > lee.nathan@southwestautosport.com
[01] 4/29 18:47:18 334 UGFzc3dvcmQ6
[01] 4/29 18:47:18 > ********
[01] 4/29 18:47:19 235 2.7.0 Accepted
[01] 4/29 18:47:19 > MAIL FROM:<lee.nathan@southwestautosport.com>
[01] 4/29 18:47:19 250 2.1.0 OK ff9sm22403403wib.2
[01] 4/29 18:47:19 > RCPT TO:<info@southwestautosport.com> [1/1]
[01] 4/29 18:47:19 250 2.1.5 OK ff9sm22403403wib.2
[01] 4/29 18:47:19 > DATA
[01] 4/29 18:47:20 354 Go ahead ff9sm22403403wib.2
[01] 4/29 18:47:20 ~ Sending message
[01] 4/29 18:47:20 ~ with ID <MNQIbkVjgaSA49sj0GDL023EMzQApn6uNMKWcij5w27z@southwestautosport.com>
[01] 4/29 18:47:20 ~ To info@southwestautosport.com
[01] 4/29 18:47:21 250 2.0.0 OK 1335721641 ff9sm22403403wib.2
[01] 4/29 18:47:21 ~ Stage 3 dispatch done
[01] 4/29 18:47:21 > QUIT
[01] 4/29 18:47:21 221 2.0.0 closing connection ff9sm22403403wib.2
[01] 4/29 18:47:21 ~ Stage 4 dispatch done
[00] 4/29 18:47:21 ~ [-??]
[00] 4/29 18:47:21 ~ Closing all streams
[00] 4/29 18:47:21 ~ Creating report...
[00] 4/29 18:47:21 ~ Finishing...
[00] 4/29 18:47:21 ~ Finished.

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MaxBulk Mailer SE Delivery Report [#25] - 29/04/2012
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Mailer version: 8.3.7-US Pro - Registered
Machine OS/speed: Mac OS 10.7.3 Lion/3.06Ghz

Streams: 3 [1 Used] Single Server
Delivery mode: Singly (Tag processing ON)

SMTP server address: smtp.gmail.com [Port: 587] SSL Off
Authentication: ESMTP (Login) | [192.168.0.8]
Groups: 250 [Interval: 00:10:00]

Delivery start date: 29/04/2012 at 18:47:16
End date: 29/04/2012 at 18:47:21
Total duration: 5 second(s) - Retries: 0/8
Rate: 0.20 recipient(s)/second

to a total of: 1 recipient(s) [1/1]
List name: unknown
Sent: 1

Mail subject: [News] From Southwest Autosport - 12th August 2012
Mail priority: Normal
Return receipt: No
Mail format: Styled Text | iso-8859-1 | quoted-printable
Mail size: 20 Bytes (Doesn't include attachments)
Attachments: none

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This log corresponds to a successful delivery. If the problem is that the message never arrives to the target mailbox I recommend you to read this page. Also bear in mind Gmail is not a server to send bulk emails. Google will do everything to prevent this.