That's all great, but I'm a travelling user connecting to a multitude of networks. In addition, I send mail from multiple accounts in parallel. So if I'm at work should the mail from my home account be blocked, or when I'm at home should mail from my work account be blocked, just because I'm not relaying the mail through that particular server? Most ISPs block relaying these days, meaning that, even if I wanted to, I cannot use my home ISPs mail server to send from the account I have with them unless I'm dialed into them, or hooked up through from home with DSL.
And what if I'm at a customer site?
After getting tired switching SMTP server addresses constantly to avoid relaying prohibited messages, I installed a local SMTP server that will route directly to the target domain. But I suspect SDF or domain keys is going to block that route as well. Any idea how to accomodate this situation?
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That's all great, but I'm a travelling user connecting to a multitude of networks. In addition, I send mail from multiple accounts in parallel. So if I'm at work should the mail from my home account be blocked, or when I'm at home should mail from my work account be blocked, just because I'm not relaying the mail through that particular server? Most ISPs block relaying these days, meaning that, even if I wanted to, I cannot use my home ISPs mail server to send from the account I have with them unless I'm dialed into them, or hooked up through from home with DSL. And what if I'm at a customer site? After getting tired switching SMTP server addresses constantly to avoid relaying prohibited messages, I installed a local SMTP server that will route directly to the target domain. But I suspect SDF or domain keys is going to block that route as well. Any idea how to accomodate this situation?