Google Apps & rejected mail


#1

We have a business cable line with a dynamic IP.

  1. One of our servers on the inside attempts to send mail

[quote]

-------- Original Message -------- Subject: Returned mail: see transcript for details
Date: Tue, 14 Dec 2010 12:45:54 -0600
From: Mail Delivery Subsystem MAILER-DAEMON@company.com
To: shipping@server.company.com

The original message was received at Tue, 14 Dec 2010 12:45:53 -0600
from server.company.com [10.0.20.10]

----- The following addresses had permanent fatal errors -----
customer@othercompanyproducts.com
(reason: 554 Service unavailable; Client host [xxx.xxx.xxx.xxx.client.mchsi.com] blocked using Barracuda Reputation; http://www.barracudanetworks.com/reputation/?r=1&ip=xxx.xxx.xxx.xxx)

----- Transcript of session follows -----
… while talking to mail.othercompanyproducts.com.:

DATA
<<< 554 Service unavailable; Client host [xxx-xxx-xxx-xxx.client.mchsi.com] blocked using Barracuda Reputation; http://www.barracudanetworks.com/reputation/?r=1&ip=xxx.xxx.xxx.xxx
554 5.0.0 Service unavailable
451 4.4.1 reply: read error from mail.othercompanyproducts.com
.[/quote]

  1. One of the employees attempts to send an e-mail to a known client with a working e-mail address via Google Apps

[quote]Subject: Delivery Status Notification (Failure)
Date: Mon, 20 Dec 2010 20:40:39 +0000
From: Mail Delivery Subsystem mailer-daemon@googlemail.com
To: employee@company.com

Delivery to the following recipient failed permanently:

 [email]customer@othercompany.com[/email]

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 550 550 No such user - psmtp (state 14).[/quote]

  1. One of our servers on the inside attempts to send mail

[quote]The original message was received at Tue, 21 Dec 2010 16:40:52 -0600
from server.company.com [10.0.20.10]

----- The following addresses had permanent fatal errors -----
customer@xxxxxx.nyc.gov
(reason: 554-xxxxxx.nyc.gov)

----- Transcript of session follows -----
… while talking to xxxxxx.nyc.gov.:
<<< 554-xxxxxx.nyc.gov
<<< 554 Your access to this mail system has been rejected due to the sending MTA’s poor reputation. If you believe that this failure is in error, please contact the intended recipient via alternate means.
… while talking to xxxxxx.nyc.gov.:

QUIT
<<< 554-xxxxxx.nyc.gov
<<< 554 Your access to this mail system has been rejected due to the sending MTA’s poor reputation. If you believe that this failure is in error, please contact the intended recipient via alternate means.
… while talking to xxxxxx.nyc.gov.:

QUIT
<<< 554-xxxxxx.nyc.gov
<<< 554 Your access to this mail system has been rejected due to the sending MTA’s poor reputation. If you believe that this failure is in error, please contact the intended recipient via alternate means.
… while talking to xxxxxx.nyc.gov.:

QUIT
<<< 554-xxxxxx.nyc.gov
<<< 554 Your access to this mail system has been rejected due to the sending MTA’s poor reputation. If you believe that this failure is in error, please contact the intended recipient via alternate means.
554 5.0.0 Service unavailable
[/quote]

How can I go about fixing this without getting static IPs?


#2

You can’t. Dynamic dialup/DSL/cable IP ranges are pretty much always on email blocklists, as the vast majority of mail from them is junk.


#3

Ok, thank you for the advice(s). I really appreciate it, as it has given me insight as to how the system works as far as dynamic and static IP reputation. Real life experience points. ;D I think we’ll be getting a static IP or two.