Mail Error 550 Sender Rejected

Question

Level 4

2,561 points

Mail Error 550 Sender Rejected

I keep getting this reply to email set to name@cox.net..

seems it doesn't like my mail server...

any ideas of what to do to fix ?

TIA

Jeffrey

<Here is the error message>

<jltol@cox.net>: host mx.west.cox.net[68.6.19.3] said: 550
<jefrey@digitalmc.tv> sender rejected (in reply to MAIL FROM command)
Reporting-MTA: dns; localhost
X-Postfix-Queue-ID: 3265B26CC4
X-Postfix-Sender: rfc822; jefrey@digitalmc.tv
Arrival-Date: Thu, 11 May 2006 13:01:53 -0500 (CDT)

Final-Recipient: rfc822; jltnol@cox.net
Action: failed
Status: 5.0.0
Diagnostic-Code: X-Postfix; host mx.west.cox.net[68.6.19.3] said: 550
<jefrey@digitalmc.tv> sender rejected (in reply to MAIL FROM command)

Quad 2.5 Mac OS X (10.4.6)

Quad 2.5, Mac OS X (10.4.6)

Posted on May 11, 2006 4:17 PM

Reply

Answer 1

Jeffrey Lee Author

Level 4

2,561 points

May 11, 2006 4:34 PM in response to Jeffrey Lee

Actually...

I think I have this fixed....

a slight change in the host name seems to have done the trick....

Reply

Answer 2

May 13, 2006 10:44 PM in response to Jeffrey Lee

It would be helpful if you could explain what you did to fix it. No need to use real domain names but I would like to know what was wrong with your domain name and what you changed to fix it 🙂

Thanks, Tom

Reply

Answer 3

Jeffrey Lee Author

Level 4

2,561 points

May 14, 2006 1:04 AM in response to Thomas Koons

as it turns out, there were a few things wrong..

first the "host name" in Mail settings was wrong.. was listed as mydomain.com, as opposed to mail.mydomain.com

Past that.... my IP address was blacklisted by smamhaus.org.... and i was able to un-blacklist it on their site.

There is also the issue of the "helo" message the mail server was sending out... which was rejeted by some servers... but changing the "host name" solved the problem.

Setting up a mail server has become much more difficult over the years.... and so this has been a real learning experience for me.

Let me know if you have any questions... I'll do my best to help ou solve them.

Reply

Answer 4

May 16, 2006 1:21 PM in response to Jeffrey Lee

Thank you very much! I'll check my settings but I believe I have the entire host/domain name in there. My problem right now is my email server becomes unresponsive for several minutes at a time throughout the day? You can view my comments at this thread.

http://discussions.apple.com/message.jspa?messageID=2324310#2324310

Thanks 🙂

Tom

Reply

Answer 5

Jeffrey Lee Author

Level 4

2,561 points

May 16, 2006 2:19 PM in response to Thomas Koons

Doubt this will help but are you running any of these services:
DHCP, DNS, NAT?

Reply

Answer 6

May 21, 2006 10:30 AM in response to Jeffrey Lee

I am running DNS but I am not behind a NAT router or do I use DHCP. I have a static address.

Thanks, Tom

Reply

Answer 7

Jeffrey Lee Author

Level 4

2,561 points

May 21, 2006 9:39 PM in response to Thomas Koons

One thing I would do for sure is upgrade your RAM. 512 is barely enough to run OSX, and while it may have been ok, it's possible that that is part of your problem. When there is not enough RAM, files have to be written to the HD, and accessed from the HD, which takes a lot longer than reading and writing from RAM.

As far as to why it seems unresponsive... I'm not sure. How many users do you have? Have you looked at the CPU usage in Server Admin? It could be a good place to start. See if the spikes in the CPU usage happens when your under your e-mail blackout, and then see what is causing the CPU usage to spike.

I doubt this is going to be much help.. but it's the best i've got for now.

Reply

Answer 8

May 24, 2006 8:47 PM in response to Jeffrey Lee

Actually I have 640MB of ram. I was thinking of a different computer 🙂

I'm not seeing much CPU usage but lookupd is constantly using 28% of my RAM. No other process comes close to that???

Could that be my problem?
Thanks, Tom

Reply

Answer 9

May 24, 2006 9:00 PM in response to Thomas Koons

I just reversed the order of my ISP's DNS servers in the network pref pain and the 28% memory dropped to .1%

I was now able to login right away. I hope this stays 🙂

Thanks, Tom

Reply

Answer 10

Jun 2, 2006 1:47 PM in response to Thomas Koons

This didn't last long as the problem came back. But I think I did just find the problem. One of my Linksys Switches just died and it could have been causing all kinds of network traffic issues???

The switch itself was not showing signs of trouble but the WAN port on my router kept blinking red which means collisions. After a little trouble shooting I found that removing the switch from the network cleard the red light.

I've had the switch removed for several days now with no issues with my email. KNOCK ON WOOD 🙂

Thanks, Tom

Reply

Answer 11

Jeffrey Lee Author

Level 4

2,561 points

Jun 2, 2006 2:47 PM in response to Thomas Koons

I'll keep my fingers crossed for you.

good luck!

Reply