Email problem: 550-Verification failed

  • Bigwebmaster
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Post 3+ Months Ago

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:

Code: [ Select ]
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
  3.   ----- The following addresses had permanent fatal errors -----
  4. someuser@somesite.com
  5.   (reason: 550-Verification failed for <admin10@myhost.com>)
  6.   ----- Transcript of session follows -----
  7. ... while talking to somesite.com.:
  8. >>> RCPT To:<someuser@somesite.com>
  9. <<< 550-Verification failed for <admin10@myhost.com>
  10. <<< 550-unrouteable mail domain "myhost.com"
  11. <<< 550 Sender verify failed
  12. 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.
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Post 3+ Months Ago

  • Bigwebmaster
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Post 3+ Months Ago

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
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Post 3+ Months Ago

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! :)
  • root[GA]
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Post 3+ Months Ago

Hey, thought I'd let you know your solution worked. Im a random google'r who came across this. thanks a bunch.
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Post 3+ Months Ago

Welcome to Ozzu Random Googler :)
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Post 3+ Months Ago

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?
:roll:
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Post 3+ Months Ago

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.
  • voltproof
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Post 3+ Months Ago

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.
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Post 3+ Months Ago

Thanks for the update.
  • Jabnael
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Post 3+ Months Ago

Another random googler, thanks for the info!!!
  • packetdreamer
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Post 3+ Months Ago

random googler. rock on.
  • Flimbles
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Post 3+ Months Ago

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
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Post 3+ Months Ago

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.
  • defa0009
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Post 3+ Months Ago

BigWebMaster, if your solution works your gonna get a cookie! :D 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
  • defa0009
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Post 3+ Months Ago

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
  • defa0009
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Post 3+ Months Ago

rjmthezonenet wrote:
Posting the solution is great (more people should do this... you never know when someone will be on Google with the same problem).

Don't forget to award yourself participation points! ;-)



I didn't see this post..... that's how I found this site and I'm glad I did!
Seems like a fantastic resource!
  • defa0009
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Post 3+ Months Ago

Still have the errors but I did find a great link to test out your server's configuration:


http://www.dnsreport.com/tools/dnsreport.ch?domain=addyourdomainhere.com
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Post 3+ Months Ago

Nice link. Thanks!
  • merc73jeff
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Post 3+ Months Ago

Maybe I am missing something here. I have been getting the following failed email for an internal server.

The original message was received at Fri, 11 Nov 2005 02:00:52 -0800 (PST) from root@localhost

----- The following addresses had permanent fatal errors ----- support@mydomain.com
(expanded from: root)

----- Transcript of session follows ----- ... while talking to mail.mydomain.com.:
>>> RCPT To:<support@mydomain.com>
<<< 550-Verification failed for <root@server1.mydomain.com>
<<< 550-Unrouteable address
<<< 550 Sender verify failed
550 support@mydomain.com... User unknown


I have the following in my /etc/hosts file


192.168.150.3 server1.mydomain.com server1


So I feeling like I'm missing something so if any sees it please let me know. Again this is from an internal server sending out reports.
  • defa0009
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Post 3+ Months Ago

From what I have read /etc/hosts must have the format:

ip-address FQDN (fully-qualified-domain-name) alias1 alias2 alias3 etc

for example this is my /etc/hosts

127.0.0.1 localhost.localdomain localhost
234.124.12.454 mysite.com server mail www

so from what I can see to start is your /etc/hosts should be:

192.168.150.3 mydomain.com server1


Did you test your server in the link I posted earlier? It will tell you
everything that is wrong with your setup. For me it was the same
error you have and it was because I didn't have my MX record set
up correctly.
  • sanch
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Post 3+ Months Ago

i am having a similar problem..with emails bouncing back from a certain domain..and its been 2 months ..i am unable to resolve the issue..can someone help me out with this..i get the following error..

The original message was received at Sun, 1 Jan 2006 22:18:39 -0800

----- The following addresses had permanent fatal errors ----- <abc@tibiadubai.com>

----- Transcript of session follows -----
... while talking to tibiadubai.com
>>> RCPT To:<abc@tibiadubai.com>
<<< 550 Sender verify failed

when i try to send an email to a user of this domain..the original email address has been withdrawn from the above error..

however the mailbox at tibiadubai.com is able to receive emails from other users ..

i had this issue when i transferred my hosting from one domain to another..the domain is however still with the previous hosting company ..i just had the dns changed to point to the new hosting compan's servers..

i am not an expert at the technical language in web hosting..

please help..i have tried contacting the hosting company ..but it seems they are also unable to resolve the issue..

you guys are my only hope... :(
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Post 3+ Months Ago

This error can also be caused by a misconfonfigured zone file unsuccessful and/or pending propagation. I have heard and seen other threads regarding this issue and conclusion. However I know for a fact that you do not need to change the hostname. I have setup dozens of boxes and all of them sucessfully share the same hostname and primary nameserver.



Bigwebmaster wrote:
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
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Post 3+ Months Ago

so wut do u say ..? how can i possibly find the error & its place of occurence an d solve it ?ny tools ?>?

others ny ideas ?

tnx in advance.
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Post 3+ Months Ago

Random googler, ncie thing..
i dont understand the second part of the post.
how do u do that?



Bigwebmaster wrote:
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
  • Alfatrion
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Post 3+ Months Ago

You could also use the smtp server configuration. I'm using FreeBSD width Sendmail and have done this:

OPEN /etc/mail/server.mc
ADD-AFTER
MASQUERADE_AS(`myserver.com')
FEATURE(`masquerade_envelope')
define(`confDOMAIN_NAME', `myserver.com')
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Post 3+ Months Ago

Another random Googler...

I'm also a SBS 2003 Admin.

Wouldn't it be possible to do the same thing in DNS on the SBS?

For example, in our dnsmgmt snapin (Start>Run>AdministrativeTools>DNS), I hope you will see:

*DNS-
-----ServerName-
----------------Forward Lookup Zones-
-------------------------------------MyDomain.com-
-------------------------------------MyDomain.local-

You see both an internal - .local and external - .com
If not you will need to create the .com zone. Right Click ForwardLookupZones> Select NEW ZONE > Follow the prompts...

Now that you have both zones in place, drill into:

*DNS-
-----ServerName-
----------------Forward Lookup Zones-
-------------------------------------MyDomain.com-


Here you will need to create a new host.
Right Click MyDomain.com> Select NEW HOST (A).
Enter hostname (mail/smtp/pop/webmail/www/etc...), Enter IP address for HOST, Click ADD HOST. Done.
  • kikwete
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Post 3+ Months Ago

Go to Start > Control Panel > Network Connections
Then right click your Local Area Connection, then click properties.
Highlight Internet Protocol (TCP/IP)
Then click properties. Then click Obtain DNS Server Automatically.
Then click ok.

That should fix it. 99% of the time thats the problem.
  • tahoecale
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Post 3+ Months Ago

Just a random guy searching on google just wanted to say thanks for the info i haven't tested it yet but i think this could be the issue with my site.

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