Who hosts what mail? MBP Spotlight is the new series here at Spam Resource where I’ll share ranking data for the top mailbox providers (including B2B!) based on where they fall in the top ten million domains. Some entries might have more info, some entries might have less, depending on what information I know about them and what information I can find online. To count rankings, I took a snapshot of MX records for the top ten million domains, and then rolled them up based on the domain name hosting mail for each domain. That shows me how many domains have their inbound email hosted by hosted ..read more

Hey, it's me! In my first blog post ever for Valimail. The topic: Connecting the dots between DMARC and deliverability. Why? To remind folks that these two things do indeed overlap and that folks sending marketing mail need to understand how both work together to impact the ability to get mail delivered successfully. Over on the Valimail blog, I'll do my best to talk about the intersection of DMARC and deliverability, how DMARC helps to improve deliverability, and what marketing senders need to keep in mind as the mailbox provider sender requirements continue to evolve. I'll probably talk ab ..read more

Let’s decode another acronym! DNS is a term not limited to email deliverability, but it sure does show up there quite a bit. And it stands for: Domain Name System. DNS is the phone book or address book of the internet. You type “www.google.com” into a web browser. The web browser (or the computer that it is running on) needs to figure out what server to connect to, and that server is identified by an IP address (an IPv4 or IPv6 IP address, the distinction being something that I’ll ignore for the moment). DNS is the function of looking up www.google.com to see what server handles the website ..read more

Folks have been reporting these past few weeks that centralized subscription management is coming to Google’s Gmail. This is a change, and change is scary, so many folks have questions and concerns. What challenges will this bring and how will this make it harder for me to get my email delivered? It turns out, the concept of centralized subscription management at the recipient end isn’t as new as you might think. Above are screenshots of how the functionality exists and works today for mail you send to Yahoo and Microsoft subscribers. With the new list-unsubscribe requirements (and even wit ..read more

It’s that time again! Time to define more deliverability terminology, as we do every so often here in the DELIVTERMS series on Spam Resource. Today, let’s define email authentication. What is email authentication? Wikipedia defines it as “a collection of techniques aimed at providing verifiable information about the origin of email messages by validating the domain ownership of any [mail servers] who participated in transferring and possibly modifying a message.” I’d call that mostly correct. Here’s what I’d say, instead: Email authentication is a collection of techniques aimed at providi ..read more

Front, a "customer operations platform that helps teams streamline communication and deliver exceptional service at scale," is hiring! They're looking for an email/deliverability-focused experienced backend engineer to "join the team responsible for the core systems which process millions of events delivering emails, SMS, and other messages to and from Front quickly and reliably." Click here to learn more and/or to apply for the "Backend Software Engineer, Deliverability" role. This is a free (not sponsored) job posting shared courtesy of Spam Resource ..read more

Just this week, Guy Hanson and Rafael Viana from Validity were joined by Microsoft's Jeff Dellapina and Mihai Costea in a live webinar talking about the current state-of-the-state when it comes to email deliverability for sending to Microsoft properties. The Microsoft folks don't always spend a ton of time in the public eye, so I think it was great of them to take this time to share their thoughts, and take questions from the audience. I found it interesting enough that I thought I'd share a link to it here, because if you're in the deliverability space and looking to hear from Microsoft dir ..read more

Who hosts what mail? MBP Spotlight is the series here at Spam Resource where I’ll share ranking data for the top mailbox providers (including B2B!) based on where they fall in the top ten million domains. Some entries might have more info, some entries might have less, depending on what information I know about them and what information I can find online. To count rankings, I took a snapshot of MX records for the top ten million domains, and then rolled them up based on the domain name hosting mail for each domain. That shows me how many domains have their inbound email hosted by hosted by ..read more

Microsoft recently announced that Exchange Online -- the email (and calendar, contacts and tasks) functionality provided in Microsoft 365 and Office 365, will be subject to outbound email rate limits as of January 2025. That "external recipient rate limit" will be 2,000 recipients every twenty-four hours. Though the note on limits suggests that users needing to send larger volumes of mail might want to consider Azure Communication Services for Email, another article covers options for High Volume Email Sending for Microsoft 365. The high volume option still seems to have limits -- 100,000 ex ..read more

Tony Patti has worked in the email sphere for more than twenty years. An expert deliverability consultant (and builder/manager of deliverability service consulting as a practice), he’s somebody I could on some level consider a competitor. We’ve worked for different companies and on different email platforms over the years, but with similar goals: Helping clients get their mail successfully delivered to the inbox by teaching them how not to be a spammer. And he's great at it! You can find his Linkedin profile here. Tony, thank you for taking the time to talk to me today! Your career path is ..read more