Email problem: 550-Verification failed

[Bigwebmaster]

February 3rd, 2004, 9:05 pm

For the most part I can send out emails fine with my server, but occasionally some hosts will reject the email giving me the 550 verification failed bounce. Here is an example of what I will receive back:

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The original message was received at Fri, 30 Jan 2004 04:59:51 -0800
from admin10@localhost

  ----- The following addresses had permanent fatal errors -----
someuser@somesite.com
  (reason: 550-Verification failed for <admin10@myhost.com>)

  ----- Transcript of session follows -----
... while talking to somesite.com.:
>>> RCPT To:<someuser@somesite.com>
<<< 550-Verification failed for <admin10@myhost.com>
<<< 550-unrouteable mail domain "myhost.com"
<<< 550 Sender verify failed
550 5.1.1 someuser@somehost.com... User unknown

1. The original message was received at Fri, 30 Jan 2004 04:59:51 -0800
2. from admin10@localhost
4.   ----- The following addresses had permanent fatal errors -----
5. someuser@somesite.com
6.   (reason: 550-Verification failed for <admin10@myhost.com>)
8.   ----- Transcript of session follows -----
9. ... while talking to somesite.com.:
10. >>> RCPT To:<someuser@somesite.com>
11. <<< 550-Verification failed for <admin10@myhost.com>
12. <<< 550-unrouteable mail domain "myhost.com"
13. <<< 550 Sender verify failed
14. 550 5.1.1 someuser@somehost.com... User unknown

I replaced the server names above with fictious ones for privacy reasons. Anyway I have setup MX records for myhost.com, I have A records as well for myhost.com all pointing to my servers IP. Has anybody experienced this problem before or know what may be causing it. I have looked around and really am stumped here.

[Bigwebmaster]

February 4th, 2004, 1:38 am

I just want to let you guys know that I have resolved the problem and here is what I did. Apparently it wasn't liking the fact that the primary nameserver and the and the actual hostname of the server were the same. All I did was change the hostname to another routable domain name such as mail.somedomain.com and made sure all the mx records were in place. That seemed to have resolve the problem. I have tested sending emails to all the hosts that have previously rejected them, and no emails bounced back. In fact I got a few responses now from them which confirms it is fixed. I have looked all across the Internet and have now found a resolution like this listed, so hopefully this helps someone else in the future.

To change the hostname of the server I typed in SSH (logged in as root user):

hostname mail.somedomain.com

I then also made sure that mail.somedomain.com came right after localhost. So in other words it looks something like:

127.0.0.1 localhost.localdomain localhost
55.555.55.5 mail.somedomain.com

February 8th, 2004, 8:45 am

we definitely encourage people to post their solutions, even if
no one had replied to the original thread. A lot of people reply
to their own posts saying "nevermind, I found the answer." We
try hard to find those people and make sure they post the
answer for someone in the future, and as you said, for google.

It's the ozzu way!

March 23rd, 2004, 6:41 pm

Hey, thought I'd let you know your solution worked. Im a random google'r who came across this. thanks a bunch.

March 23rd, 2004, 7:40 pm

Welcome to Ozzu Random Googler

April 7th, 2004, 12:24 am

Hi,

we have sbs2k and exchange has been set up and runs absolutely fine both for internal/external and inbound/outbound emails. The problem we get is when we try to send emails to a particular address, the user sending gets the following email back to them within seconds:

Internal domain abc.co.uk trying to send emails to xyz.co.uk

Your message did not reach some or all of the intended recipients.

Subject: test 12:17
Sent: 06/04/2004 12:15

The following recipient(s) could not be reached:

info@xyz.co.uk on 06/04/2004 12:25
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<servername.abc.co.uk #5.5.0 smtp;550-Verification failed for <user@abc.co.uk>>


The exchange server receives emails on a public static IP through MX record change.
i have spoken to BT (ADSL provider) to see if there was any sort of anti-spam filters and they aren't much help.

The recipient xyz.co.uk say that they don't restrict any mail and that they send/receive just fine.

I am really stuck, i have ran out of ideas, anyone got any clues?

[ATNO/TW]

April 7th, 2004, 7:04 am

Some SMTP servers will reject mail if the sending host doesn't have a PTR record in the reverse lookup. I ran into this problem a couple weeks ago where if anyone would try to send to anyone@aol.com it would get bounced. It turned out to be a problem AOL had to fix, but I was informed by my host that this was why it was happening.

Double check to make sure you have a PTR record for your mail server.

April 7th, 2004, 7:20 am

Hi, thanks for the posting.

We run our own Exchange server, the hosting company has changed the MX record to forward all mail request to the public IP address where Exchange server is waiting to collect and handle the mail.

Where would the PTR record be stored? Would this be with the hosting company or within our Exchange server?

I know someone in this group had the same problem but i couldn't work out the solution from his posting. He wrote the following:

".........

I just want to let you guys know that I have resolved the problem and here is what I did. Apparently it wasn't liking the fact that the primary nameserver and the and the actual hostname of the server were the same. All I did was change the hostname to another routable domain name such as mail.somedomain.com and made sure all the mx records were in place. That seemed to have resolve the problem. I have tested sending emails to all the hosts that have previously rejected them, and no emails bounced back. In fact I got a few responses now from them which confirms it is fixed. I have looked all across the Internet and have now found a resolution like this listed, so hopefully this helps someone else in the future.

To change the hostname of the server I typed in SSH (logged in as root user):

hostname mail.somedomain.com

I then also made sure that mail.somedomain.com came right after localhost. So in other words it looks something like:

127.0.0.1 localhost.localdomain localhost
55.555.55.5 mail.somedomain.com


................."




Thank you.

[ATNO/TW]

April 7th, 2004, 7:29 am

Thanks for the update.

August 5th, 2004, 10:20 am

Another random googler, thanks for the info!!!

September 20th, 2004, 9:09 am

random googler. rock on.

September 23rd, 2004, 3:05 am

Ok guys, I have a problem a bit similar to this, but here is the problem;

I have a site setup on a dedicated server but the name was registered elsewhere, The DNS settings have been changed to the dedicated server, and the site works fine.

Any e-mail address That i now create can send e-mails but will not recieve, when Itry to send e-mail to these address' they all bounce back from all types of accounts the error I get is as follows;

This Message was undeliverable due to the following reason:

"Each of the following recipients was rejected by a remote mail server.
The reasons given by the server are included to help you determine why
each recipient was rejected.

Recipient: <name@domain.co.uk>
Reason: 5.7.1 <name@domain.co.uk>... Relaying denied. Please check your mail first.


Please reply to Postmaster@ntlworld.com (THIS CAN BE ANY ISP)
if you feel this message to be in error."

Where do I start to solve this? any clues would be great

Thanx

[ATNO/TW]

September 23rd, 2004, 5:50 am

SMTP servers will not relay mail from just anyone. This is by design in order to prevent spamming. The solution Bigwebmaster provided above should solve your problem as well. In addition to the MX records and host name for the mail server, some SMPT servers require that a reverse pointer record be in place. If you do not have the ability to do this on your server or not sure how, check with your host. They should be able to help you get it set up correctly.

November 11th, 2005, 10:27 am

BigWebMaster, if your solution works your gonna get a cookie! I have these errors coming back ever so often:



----- The following addresses had permanent fatal errors -----
<someguy@somewhere.com>
(reason: 503 valid RCPT command must precede DATA)

----- Transcript of session follows -----
... while talking to mxs.mail.ru.:
>>> DATA
<<< 503 valid RCPT command must precede DATA
554 5.5.0 Remote protocol error




----- The following addresses had permanent fatal errors -----
<someguy@somewhere.com>
(reason: 550-Verification failed for <me@mydomain.com>)

----- Transcript of session follows -----
... while talking to mx.somewhere.com.:
>>> DATA
<<< 550-Verification failed for <me@mydomain.com>
<<< 550-unrouteable mail domain "mydomain.com"
<<< 550 verifying me@mydomain.com failed
550 5.1.1 <someguy@somewhere.com>... User unknown
<<< 503 valid RCPT command must precede DATA

November 11th, 2005, 10:33 am

BigWebMaster a quick question? Your /etc/hosts file has the line

55.555.55.5 mail.somedomain.com

correct me if I am wrong but shouldn't it be...

55.555.55.5 somedomain.com mail