Note: This page serves as an introduction and quick overview of SPF mechanism syntax. For the complete and definitive picture, please see the specification.
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Keep your emails private and secure with robust encryption
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A private inbox
60 GB total storage
(Add more if needed)
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Keep your emails private and secure with robust encryption
Extra email addresses for personal and work
Use your own domains to make custom addresses
Setting up and securing Roundcube and going forward into a self-hosted future.
We load up OpenDKIM, SpamAssassin, ClamAV, and get Sieve filtering operational.
Gmail? Apple? The cloud? Forget ’em all—in this series, we take your e-mail back.
Our self-hosting e-mail series continues as we get our ducks—and doves—in a row.
Domains that do not send emails can still be used in email spoofing or phishing attacks, but there are specific types of DNS text (TXT) records that can be used to stifle attackers. Each of these records sets rules for how unauthorized emails should be treated by mail servers, making it harder for attackers to exploit these domains.
When every email is in its place, that doesn’t mean you find stuff. At least not reliably, let alone fast. This is a scientifically proven fact (see this research paper or its summary).
Note that this is about folders that sort emails by content in some sort of hierarchy. There are folks who prefer action based “folders”, say a “Read later” or “urgent”, but those are essentially just labels meant to help with productivity, not real folders that are about filing and finding emails. //
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Sorting mails into folders doesn’t feel like a good use of my time. I should be doing something that carries more value, like actually acting on my email
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Of all the emails I receive (and that I want to keep), it’s my wild guess that I will need to find – at most – 10% ever again. The problem is: I don’t know which 10% of the 100% of received emails my future self will need. Moving an email to a folder takes time, and I can’t do it on autopilot.
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The filing system I set up will need to anticipate my future self’s search logic. Highly non-scientific empirical behavioral research on a sample of 1 (me) clearly shows that the brain functions governing filing things and finding things differ. If you are a folder person, I bet that you too have experienced going from folder to folder to folder, trying to figure out where the heck that email that you just know you diligently filed exactly where it belongs actually is.
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Some email I want to sort away may fit the topic of folder A just as well as folder B. Does it go in A? or in B? Put a copy in both? Decisions! More thought processes! //
Setting up a new rule, your email client usually allows you to apply the rule to existing emails. So it’s going through your emails and filters away according to the rule you just set up. You know what that is? This is, in fact, a search operation on your email database.
So what is the difference between an automated filtering rule and a search? A rule is a search that you set up without having a need yet. You may never need the rule you set up. You may be setting up the wrong rule/search.
(You may want to set up rules that filter away emails automatically so you don’t even see those emails – you can’t unsubscribe everything, this kind of rule is not really for filing, it’s like a spam filter. Ask yourself if you are actually looking at those emails ever, and be bold to unsubscribe.)
So if rules are the answer to the issues with folders, and search is kind of equivalent to rules, then the answer actually is to scrap all those folders! Ok. Most folders. //
If your preferred email program has a good search function, you may consider stopping to file stuff.
Important news for Gmail power users: Google is dropping the feature whereby Gmail can collect mail from other email accounts over POP3.
The company hasn't exactly gone out of its way to call attention to this – like actually telling anybody anything. The news appears in a support note with a sign on the door saying "Learn about upcoming changes to Gmailify & POP in Gmail." The article itself is less euphemistic than its title: //
7 hrs
MaFt
Still working for me?
Importing from POP is still working for me. It did, however, stop just before Christmas and I had to change the settings on gMail to use TLS.
So it seems like they're stopping plain text authorisation for POP rather than ALL POP mail retrieval.
SPF "breaks" email forwarding. SRS is a way to fix it. SRS is a simple way for forwarding MTAs to rewrite the sender address.
For a mail transfer agent (MTA), the Sender Rewriting Scheme (SRS) is a scheme for rewriting the envelope sender address of an email message, in view of remailing it. In this context, remailing is a kind of email forwarding. SRS was devised in order to forward email without breaking the Sender Policy Framework (SPF)
In my previous post Custom Domain E-mails With Postfix And Gmail: The Missing Tutorial, we set up a Postfix mail server on a custom domain that integrates seamlessly with Gmail.
However, the tutorial skipped two important security standards that will help prevent e-mails routed through our server from being marked as spam: DKIM and SRS. This article will show you how to add support for DKIM and SRS to a Postfix server. //
DKIM, short for DomainKeys Identified Mail, is a mechanism for
- A sender e-mail program to sign an outgoing e-mail message, and
- A recipient e-mail program to verify said signature.
SRS, short for Sender Rewriting Scheme, is a standard for including forwarding / relay information in a forwarded / relayed e-mail message.
All of your MX record, DNS, blacklist and SMTP diagnostics in one integrated tool. Input a domain name or IP Address or Host Name. Links in the results will guide you to other relevant tools and information. And you'll have a chronological history of your results.
If you already know exactly what you want, you can force a particular test or lookup. Try some of these examples:
SPF Record Syntax
Domains define zero or more mechanisms. Mechanisms can be used to describe the set of hosts which are designated outbound mailers for the domain.
Sympa is an electronic mailing list manager. It is used to automate list management functions such as subscription, moderation and management of archives. Sympa also manages sending of messages to the lists, and makes it possible to reduce the load on the system. Provided that you have enough memory on your system, Sympa is especially well adapted for big lists. For a list with 20 000 subscribers, it takes 5 minutes to send a message to 90% of subscribers, of course considering that the network is available.
The guidelines in this article can help you successfully send and deliver email to personal Gmail accounts. Starting in 2024, email senders must meet the requirements described here to send email to Gmail personal accounts. A personal Gmail account is an account that ends in @gmail.com or @googlemail.com.
For the latest updates about sender requirements, visit the Email sender guidelines FAQ. //
When increasing sending volume, keep in mind:
- Increasing the sending volume too quickly can result in delivery problems. As you gradually increase your sending email volume, use Postmaster Tools to monitor email delivery.
SPF helps prevent your outgoing email from being marked as spam by receiving email servers. Set up SPF by adding an SPF DNS TXT record (SPF record) to your domain.
An SPF record is a line of text that you add to your domain, following your domain provider’s instructions. The line of text uses special syntax and lists all the servers that send email for your domain. Here’s an example SPF record:
v=spf1 include:_spf.google.com ~all
When receiving servers get email messages from your domain, they check the SPF record to verify that the messages came from authorized servers.
DMARC tells receiving email servers what action to take on messages from you that don't pass SPF or DKIM authentication. The action options are reject, quarantine, or deliver the message. You can also get reports that help you identify possible authentication issues and malicious activity for messages sent from your domain. Set up DMARC by adding a DMARC DNS TXT record (DMARC record) to your domain.