Spam Resource: All Things Deliverability

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 …

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 outb…

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)…

Have you ever seen this SMTP error message? 450 4.2.1 The user you are trying to contact is receiving mail at a rate that prevents additional messages from being delivered. Pleas…

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…

Hey, look what I stumbled across ! Chris Zullo, Salesforce Consultant and  Business Puzzle Solver , did a most excellent job capturing my 2020 presentation on deliverability for …

Publisher's note: I asked Mike Hillyer , co-founder of Kumo Corp, the folks behind the new open source high-performance MTA platform KumoMTA , if he might want some blog …

Are you tying to send mail to users at Microsoft OLC domains like Outlook.com and are receiving rejections back that look like this: 532 5.3.2 STOREDRV.Deliver; Missing or bad ma…

Sree writes: Help! Our newsletter business is receiving the Gmail "unusual rate of unsolicited mail mentioning your URL" error message. Specifically: " 421 4.7.28 …

WOW! Thank you everyone for your readership, friendship, shared knowledge and insight over the years. Thanks to your partnership and participation, Spam Resource has just reach…

First in a new series: Who hosts what mail? MBP Spotlight is the brand new series here at Spam Resource where I’ll share ranking data for the top mailbox providers (including B…

My friend Denise Miller has reminded me that we need more fun things in our lives and requested that I continue to post music periodically. At her request and suggestion, here…