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Comment by 333c | Hacker News Reader

> To me the only downside is the mobile app isn't quite as polished as Gmail. It doesn't work offline, and I notice occasional bugs or awkwardnesses. But it's still very usable, and I much prefer the Fastmail web interface to Gmail.

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.

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Yes, they support SMTP and IMAP just fine. In fact, they're one of the few providers that actually support IMAP push with iOS's Mail: https://blog.fastmail.com/2016/12/21/what-we-talk-about-when...

This is the best part of a standards-compliant service like FastMail. Gmail is extremely challenging to use with third party clients because it's custom features aren't supported. I've long had Gmail randomly archive (in no folders) email I told it to delete via an IMAP client, or duplicate items in multiple folders (i.e. labels) or other weird behaviors.

> 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.

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.

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.

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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