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550 5.7.1 Sender ID (PRA) Not Permitted

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--- Quote ---This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:
    SMTP error from remote mail server after end of data:
    host []:
    550 5.7.1 Sender ID (PRA) Not Permitted
--- End quote ---

A company with which we correspond a lot keeps producing this error report and all emails are bounced.

It always happens with Sue's tiscali account through Thunderbird. It never happens with my account through gmail. The company claims not to have any problem. All the research I have done points to a problem with MS Exchange, which makes it THEIR problem. But why would they bounce Sue's emails and not mine?

Your baffled bunny, M

they are using the new MTA sender id system that backtracks & checks whether the sender is on a spam blacklist & it looks like it has blacklisted Tiscali as they allegedly have open relays or Tiscali's email server is sending an incorrect header that the receiving one cannot read and that then rejects as a suspicious entry or forged header

Nothing connected with Tiscali surprises me

gmail being webbased is all but impossible for a spammer to mass spam from

Is she sending thjrough a Tiscali account when dialled up/connected  with a different ISP as taht will often cause that rejection as the Tiscali email adddress header will not correspond with a tiscali IP address so will be spam blocked


--- Quote ---Sender ID   Exchange Server 2003 SP2 delivers the long-awaited Sender ID filtering technology, which primarily targets forgery of e-mail addresses. The elimination of spoofed mail will immediately cause a significant reduction of mail traffic into the Exchange organization. Preliminary data from the internal IT department at Microsoft shows that enabling the Sender ID filter allowed Microsoft to achieve an approximately 10 percent net increase in spam capture before mail is transmitted to Exchange Intelligent Message Filter for additional anti-spam processing. Stopping spoofed mail at the gateway is important because the reduction of mail traffic into the Exchange organization reduces bandwidth consumption and eliminates the overhead of processing these messages in the internal mail infrastructure.
--- End quote ---

but read down to see the pretty pictures that explain how it works

--- Quote ---Here are the steps in the Sender ID verification process in Figure 1:

   1. A sender sends an e-mail message to the receiver.
   2. The receiverís inbound mail server receives the e-mail message and extracts the PRA.
   3. The inbound mail server checks which domain claims to have sent the message, and examines the domain name system (DNS) for the sender policy framework (SPF) record of that domain. These SPF records identify authorized outgoing e-mail servers. The inbound server determines whether the sending e-mail server's IP address matches any of the IP addresses that are published in the SPF record. For more information about what an SPF record contains and how to create an SPF record, see Sender ID.
   4. If the IP addresses match, the e-mail message is authenticated and delivered to the receiver. If the IP addresses do not match, the e-mail message fails authentication and is not delivered.
--- End quote ---

According to your IP number you are presently connected to NTL so if a server receives an email from you  via your NTL connection, but sent from a Tiscali email address then it will reject it as spoofed or fake unless you set the smtp server to NTL & not Tscali in your  email client

Thanks Derek

Might be a problem to take the advice as blueyonder only accepts outgoing mail thro  It won't accept

I shall contact the company and see if they can get the protocols to accept Sue's emails.

Thanks again, M


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