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Old 11 Jan 2017, 02:19 PM   #13
n5bb
Intergalactic Postmaster
 
Join Date: May 2004
Location: Irving, Texas
Posts: 8,917
I'm as confused as the other posters about this report. If I create a personality (or use a wildcard personality) with a non-Fastmail From domain, the characters "fastmail" do not appear in the raw content of the message as received.
  • Can you examine the full headers (or raw message) which was received and post the From header content? You should munge (change) the part to the left of @ and replace any custom domain by "mydomain" in any addresses, but please leave any Fastmail owned domain as-is.
  • Also, can you use the current Fastmail interface and look at the Settings>Identities & Fetch entry for the identity you are using to send these messages. Click Show advanced preferences and tell us if you have anything in these areas:
    • Reply To: (normally contains the From address shown at the top of the page -- let us know if it's different)
    • Send via: (if this is checked, the email is sent through some other non-Fastmail SMTP server)
Some additional questions and comments:
  • Are you sure you aren't using any email forwarding or POP email transfer along the way?
  • Do you have your domain hosted at Fastmail, so that it appears on the Settings>Domains screen?
  • DMARC, SPF, and DKIM are being used by more and more domains to prevent spammers and spoofers from sending messages from servers not associated with the domain or otherwise spoofing email content. So even though you may want to create From headers at non-Fastmail domains when sending from Fastmail, this technique already causes problems and in the near future will cause these messages to be rejected if you use domains which use a strict DMARC policy. So if you want to stay out of trouble, send Gmail through Gmail servers, Outlook.com/Hotmail.com through hotmail.com servers, etc.
  • If you don't have a DMARC or SPF policy published for a domain you own, you can send through any SMTP server you want. But so can others spoofing your domain, so you many be eventually forced to use these modern reputation security techniques.
Bill
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