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n5bb · 28 Aug 2018, 11:54 AM

Let's make this very clear:

Go to Settings>Identities & Fetch
Click Add Identity/Fetch at the top
Enter *@domain, where domain is any domain. I suggest either using a domain you own or *@example.com (since example.com is a recognized test domain). Then click Next.
Now enter your name (used in From) and a signature. Then click Save at the top.

Now when you start a Compose message (or reply or forward), you can change the sender identity (shown above the To line) to the wildcard identity you created.

The wildcard * in the identity is initially automatically replaced with the local-part of your default Fastmail account local-part to create the default From address.
You can now edit From to anything you like (at any domain).
But reputation indicators (DMARC and SPF, for example) may fail, since you are sending a message from a SMTP server which isn't allowed by domain records.
For example, if you try sending in this manner using a Gmail From address to a Gmail recipient address, the recipient will see a very large warning about the message probably being fake.
But if you send such a message with a Gmail From address to a different Fastmail account, the message will be received with no serious warning.
- Examining the full headers shows that "Email failed DMARC policy for domain" and the vacation response and address book whitelisting features will be ignored (since SPF and DMARC fail).
- At this time, Fastmail generates a SPF_SOFTFAIL X-Spam-hits score and as described above makes it easier to fail the spam filter.
- If the recipient replies to that message, the reply will be sent to the From address you created.
In the future Fastmail (and many other email providers) will most probably start using DMARC and ARC. See:
https://fastmail.blog/2016/12/24/spf-dkim-dmarc/

Bill

28 Aug 2018, 11:54 AM	#8
n5bb Intergalactic Postmaster Join Date: May 2004 Location: Irving, Texas Posts: 8,929	Let's make this very clear: Go to Settings>Identities & Fetch Click Add Identity/Fetch at the top Enter **@domain**, where domain* is any domain. I suggest either using a domain you own or @example.com (since example.com is a recognized test domain). Then click Next. Now enter your name (used in From) and a signature. Then click Save* at the top. Now when you start a Compose message (or reply or forward), you can change the sender identity (shown above the To line) to the wildcard identity you created. The wildcard * in the identity is initially automatically replaced with the local-part of your default Fastmail account local-part to create the default From address. You can now edit From to anything you like (at any domain). But reputation indicators (DMARC and SPF, for example) may fail, since you are sending a message from a SMTP server which isn't allowed by domain records. For example, if you try sending in this manner using a Gmail From address to a Gmail recipient address, the recipient will see a very large warning about the message probably being fake. But if you send such a message with a Gmail From address to a different Fastmail account, the message will be received with no serious warning. Examining the full headers shows that "Email failed DMARC policy for domain" and the vacation response and address book whitelisting features will be ignored (since SPF and DMARC fail). At this time, Fastmail generates a SPF_SOFTFAIL X-Spam-hits score and as described above makes it easier to fail the spam filter. If the recipient replies to that message, the reply will be sent to the From address you created. In the future Fastmail (and many other email providers) will most probably start using DMARC and ARC. See: https://fastmail.blog/2016/12/24/spf-dkim-dmarc/ Bill