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FastMail Forum All posts relating to FastMail.FM should go here: suggestions, comments, requests for help, complaints, technical issues etc. |
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16 May 2022, 11:52 PM | #1 |
Cornerstone of the Community
Join Date: Mar 2002
Location: Florida
Posts: 545
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redirecting to gmail?
I have an alias (in my own domain) which delivers to two end points, using Sieve. The first end point is a fileinto to a folder in my account. The other is a redirect to a gmail address of another person.
I have just discovered that some of the messages have not been delivered to the gmail address -- some are delivered, some are not. Also, that same partial delivery occurs if I "forward as attachment" to that address. The problem may be worse (I've only observed a small number) when the original sender is on gmail. I assume that gmail is filtering it in some way due to being routed through Fastmail. Any ideas on just what is happening, or what I might do about it? Edward |
17 May 2022, 03:25 AM | #2 |
The "e" in e-mail
Join Date: Oct 2002
Location: Holon, Israel.
Posts: 4,829
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Perhaps doing it not with Sieve, but with defining two targets for the alias would make a difference? (one target would be the gmail address; the other your Fastmail account, and then of course you can file it with Sieve).
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17 May 2022, 06:57 AM | #3 |
Essential Contributor
Join Date: May 2018
Posts: 474
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Have those gmail recipients checked their gmail's spam folder to see if this missing messages are in there?
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17 May 2022, 12:55 PM | #4 |
Intergalactic Postmaster
Join Date: May 2004
Location: Irving, Texas
Posts: 8,922
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Email forwarding can cause messages to become untrusted
I would guess that this is probably due to DMARC (DKIM and SPF techniques) settings at the domain of the original sender. See:
Fastmail help - Sender Authentication Fastmail blog - SPF, DKIM & DMARC: email anti-spoofing technology history and future As pointed out in those links above, some email senders (including some mailing lists) can break DKIM, and forwarding breaks SPF. DMARC requires address alignment, which usually fails when email is forwarded. Unfortunately, current methods for automatic email forwarding and redirection can cause authentication (DMARC, SPF, DKIM, ARC, etc.) to fail at least partially. The sending domain DNS records can request that authentication be strictly applied. This can help with blocking spoofing senders of spam, but means that an email may be classified as spam (or discarded, depending on the final receiving server and the sending DNS authentication records) if the sender does any of these things:
Bill |
18 May 2022, 12:55 AM | #5 |
Cornerstone of the Community
Join Date: Mar 2002
Location: Florida
Posts: 545
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Thanks. I suspected that DMARC might be involved, and Bill explains the details.
After I figured out how to reach the spam folder in gmail, the recipient found the recent messages there. I investigated gmail filters, and it looks like I'll be able to solve the problem with those. The emails in question always have the same To:, which gmail allows filtering on, and one of the optional actions is "never send to spam". Sounds perfect. Now I just need to explain how to do this to the non-techie recipient. Edward |
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