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A comment on The FastMail Security Mindset. Parent comment

Re:The FastMail Security Mindset by distances on Tuesday December 05, 2017 @04:20PM (#15856103)
> But FastMail supports other clients, right? I don't want to be forced to use their web interface or their app; I'm happy with the Apple-written Mail apps.

It does, but at least for me the problem is using my separate forwarding-only e-mail address instead of fastmail.com as the sender. As far as I see, I need the native app for this.

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Re:The FastMail Security Mindset by brongondwana on Tuesday December 05, 2017 @08:22PM (#15857760)
FastMail.com can send via a forwarding email address. You'll need to set up authentication at FastMail so it can authenticate to the forwarding service of course.
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Re:The FastMail Security Mindset by distances on Wednesday December 06, 2017 @04:52AM (#15859857)
I don't use the forwarding service to send. I use it to forward incoming mail to FastMail, and in FastMail I just fake the sender address when sending e-mail.
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Re:The FastMail Security Mindset by brongondwana on Wednesday December 06, 2017 @08:21AM (#15860848)
Sadly your use-case is dying. Asymmetric mail flows are becoming harder and harder to support, as DKIM/DMARC alignment and SPF become stronger anti-spam signals, we're going to have to lock down on egress for domains which we don't have proof of control for.
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