It seems that Verizon has setup a new system where they require that all incoming messages to their servers be authenticated by the sending SMTP server with User Authentication. This means that the Verizon servers send back a response when SIMS tries to send a message and that response requires that SIMS verify that the sender of the message is an authorized user on the SIMS server. Since SIMS does not support this all of our email sent to anyone on Verizon's email servers gets rejected.
I called Verizon when we noticed that all messages to them were getting rejected and had to keep asking for supervisors until I finally got to one that knew what the problem was. They said that it was a new policy that their engineers had implemented and that they were having a lot of complaints from other ISPs but that they were not going to change their policy. I had them escalate my complaint to the engineering department asking to be called back.
Has anyone else noticed this yet and what are we to do, can we hack SIMS using ResEdit so it sends the correct response? Can we please get Stalker to modify SIMS so it response correctly?
I am aware of this deeply stupid policy decision by the imbeciles at Verizon, but I am not clear on how SIMS is causing trouble in conjunction with it. Do you have a detailed log snippet showing what Verizon is doing to 'authenticate' the sender and how SIMS is responding badly?
It was my understanding from a discussion with one of the technical people at Verizon that they are essentially just mimicking sending a message to the Return-Path on mail offered to them and stopping after the RCPT command gets a positive of negative response. There are some serious issues with what they are doing from scaling and attack vector perspectives, (i.e. what happens if everyone does it and what happens if someone tries sending Verizon users mail from a few million different bogus addresses in a domain whose mail server is running on a IIci on a 33.6k nailed-up analog link...) but in general SIMS should do the right thing unless you've done something like shunning the return path used for the test.
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Bill Cole [EMAIL PROTECTED]
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