Relaying denied

Salu · 30-07-2004, 16:17

Has anyone overcome this random problem?

The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was '<someone@example.com>'. Subject: '<Test>', Account: '<Test>', Server: '<smtp.example.com>', Protocol: SMTP, Server Response: '550 <someone@example.com>... Relaying Denied', Port: 25, Secure (SSL): No, Server Error: 550, Error Number: 0x800CCC79

Microsoft has a kb page on it and it is helpful but I have had the problem no matter what SMTP server I am using. I have had it on several different NTL setups with and without routers.

Any thoughts?

http://support.microsoft.com/default...roduct=out2003

JonathanLH · 30-07-2004, 17:27

uh, since you've blanked out the email you are trying to send to, and the server in question, it is difficult to advise you
if you connect to hotmail's smtp server from your ntl connection, and try to send to a hotmail email address, since the hotmail smtp server is authoritive for that email, it may accept it (may not due to blocking dhcp ranges for spamming)
it will not accept email to say; freeserve users, because that would be an open relay.
NTL's email servers will accept email to anywhere because we are on their ip space.

Salu · 02-08-2004, 09:49

Thanks for that Jonathan.

The error was lifted from the MS KB to show an example of the error that I have seen. I understand about relaying being denied to stop spammers and indeeed all the PCs that I have seen this on have continued to use their old ISPs such as virgin.net and freeserve which do have relaying denied I believe.

What I don't understand is the randomness of the error. They are all using Outlook client (2003) and are using ntlworld's SMTP server to send mail and recieve mail using their previous ISP's pop3 server.

This error raises it's head every few weeks followed by several weeks of no problems with no settings changes....

JonathanLH · 02-08-2004, 17:29

then i would put it down to the ntl smtp service being a little "flakey"

nate · 03-08-2004, 12:32

Which error number is it?

550, 553, other?

zovat · 04-08-2004, 14:09

I had this when I was trying to send via a non NTL SMTP server...

change the account to send via the NTL smtp, and all should work nicely. (at least it did for me

)

(I made the assumption that NTL had updated their SMTP server to stop relaying)

the SMTP server does not care what "from" address you use, but will not allow you to go to another SMTP server directly.

Hope this helps...

<edit> - bugger must read the rest of the posts before replying -

I can see no reason for this error, unless the outlook accounts are trying to use a differnt SMTP server - as they do not appear to do so, this could be a timeout issue.

Is there a pattern to this, or is it truly random...

Salu · 04-08-2004, 16:11

It's random.

There are several accounts in Outlook all using different POP3 servers but all using NTLWORLD.COM SMTP servers.....

My mum (one of the users reporting this) said that if she forwards the message after a failure then it works......I can't rationalize this though...

zovat · 04-08-2004, 16:26

Strangly enough - this error can be caused by a nameserver/DNS lookup error, and also by the mailbox not being available..

Given the recent (ongoing) mail issues, this may be some kind of timeout, or network related issue.

more than that I cannot really say (I am neither Windows expert, nor NTL employee

)

nate · 04-08-2004, 17:00

Quote:

Originally Posted by zovat

The SMTP server does not care what "from" address you use, but will not allow you to go to another SMTP server directly.

This is not true, some of the new SMTP servers do.
If your from address is incorrect, you will (or may) get an error 553 (as soon as the new servers are all rolled out you'll always get it).

Errors in the 55* category were designed to stop spammers.
If you are connected to ntl, then you will need to use the ntl smtp server, with a correct from address.

You will not (or at least shouldn't) be able to send to any other domain using an SMTP server that does not belong to your ISP (ruling out purchased/rented servers here).

Chris W · 05-08-2004, 21:48

check that you have the correct reply to address, as this can cause messages to be rejected by some mail servers. If you do not need a different reply to address make sure that it is left blank

zovat · 05-08-2004, 23:24

Quote:

Originally Posted by nate

This is not true, some of the new SMTP servers do.
If your from address is incorrect, you will (or may) get an error 553 (as soon as the new servers are all rolled out you'll always get it).

Errors in the 55* category were designed to stop spammers.
If you are connected to ntl, then you will need to use the ntl smtp server, with a correct from address.

You will not (or at least shouldn't) be able to send to any other domain using an SMTP server that does not belong to your ISP (ruling out purchased/rented servers here).

I sit corrected

That could be a bit of a pain however - as I am unable to mail out via my hosting ISPs SMTP server, as NTLs SMTP server thinks I am relaying...