Latest News - Email

Tis the Season

2023-11-21 12:54:40 +0100 | Source: Word to the Wise

Meanwhile… I apparently gave an email address in 2007 – probably due to a client engagement? I don’t know. I unsubscribed from their mail at some point as there has only been one... Read more

Tags : Spam

Yahoogle Requirements Update

2023-11-09 15:01:20 +0100 | Source: Word to the Wise

Since I wrote about it last month the requirements for bulk senders to Yahoo and Google have changed a little. The big change is that bulk senders need to authenticate with both SPF and DKIM, rather than SPF or... Read more


2023-10-25 11:40:51 +0200 | Source: Word to the Wise

Email supports TLS (Transport Layer Security), what we used to call SSL. Unlike the web, which split it’s TLS support off into a completely different protocol – https, listening on port 443 vs http... Read more

Tags : Open

Customer subdomain authentication

2023-10-20 16:50:09 +0200 | Source: Word to the Wise

On Tuesday I wrote about using DNS wildcards to implement customer-specific subdomains for email authentication. As I said then, that approach isn’t perfect. You’d much prefer to have per-customer... Read more

Wildcards and DKIM and DMARC, oh my!

2023-10-18 13:34:08 +0200 | Source: Word to the Wise

If you’re an ESP with small customers you may have looked at the recent Google / Yahoo requirements around DMARC-style alignment for authentication and panicked a bit. Don’t impersonate Gmail From:... Read more

Deferrals at Microsoft

2023-10-11 13:28:22 +0200 | Source: Word to the Wise

If you’re seeing a lot of “451 4.7.500 Server busy. Please try again later” from Office365 this morning you’re not alone. Microsoft are aware of the issue, and incident EX680695... Read more

When Asking a Question

2023-10-05 13:30:32 +0200 | Source: Word to the Wise

A lot of beginner questions about email delivery aren’t about broad strategies for success, or technical details about authentication, or concerns about address acquisition. They’re something like: My... Read more

New Requirements for Bulk Senders

2023-10-03 18:18:19 +0200 | Source: Word to the Wise

Google are circulating a new set of requirements for bulk senders on their blog. So are Yahoo. It’s almost like postmasters talk to each other or something. If you dig through the links in the Gmail blog... Read more

Tags : Gmail

Validity Charging for Feedback Loop Emails

2023-09-14 10:16:37 +0200 | Source: Word to the Wise

History Return Path was a major driver for the establishment of Feedback Loops (FBLs) back in the mid to late 2000s. They worked with a number of ISPs to help them set up FBLs and managed the signup and validation... Read more

The trouble with CNAMEs

2023-09-07 17:06:49 +0200 | Source: Word to the Wise

When you query DNS for something you ask your local DNS recursive resolver for all answers it has about a hostname of a certain type. If you’re going to a website your browser asks your resolver for all records... Read more