Spam Resource: All Things Deliverability

Help! I'm getting mail from MAILER-DAEMON@(various domains) with subject lines like: Delivery Status Notification (Failure), failure notice, Mail delivery failed: returning message to sender, Message Delivery Failure - Mail Delivery System, **Message you sent was blocked by…

I very briefly touched on MailMonitor back in 2020 , but I happened to talk to CEO Adrian Patel recently and so I asked him if he would like to provide an overview of MailMonitor's deliverability tools that I could share with you and the world. Below is what he sent along,…

Need to export a file from Linux via email? Got  uuencode ? Do you even remember  uuencode ? It's how we used to encode files for file sharing, back before you were born. Because I'm old. Here's a handy one-liner that will wrap your file up as a UUEncoded attachment…

Well, Ben Chestnut and Dan Kurzius (who famously funded Mailchimp via their personal credit cards, telling me in the past that they had taken no outside investment or debt) probably can now afford to buy everybody in Atlanta a burger at the Vortex (as they kindly did for for me…

Looking to segment your email database based on ISP? Want to break out separate content or timing for Yahoo Mail versus Microsoft OLC versus Gmail subscribers? I’ve got you covered. Click here to download the full “MAGY” (Microsoft, AOL, Gmail, Yahoo) domain list , and feel fre…

Yahoo is Yahoo again! The entity that runs the servers hosting the mailboxes for AOL and Yahoo is now called Yahoo Inc, as of September 1st, 2021. No more Verizon Media. You can find their updated corporate website here , and you can see that the sale of Yahoo by Verizon Media …

As part of UPC's sale of various assets to Vodafone , I am reliably informed that the domains upcmail.hu, chello.hu, and monornet.hu no longer host email users and should be considered retired. As of this writing, all still have MX records, but any attempts to mail those u…

Timely. Here is " Everything you need to know about BIMI and validated mark certificates, how they increase brand trust, and which companies have adopted them ," courtesy of World Trademark Review. This analysis, authored by Jeremy Speres, partner at Spoor & Fishe…

Thanks to William Gallagher from Apple Insider for letting us know that Apple has launched the ability to configure a custom email domain with iCloud Mail. It's explicitly noted as being in beta, and it sounds like the process is a bit buggy so far, but they'll get it …

I'm not 100% sure of the  exact  day that I first posted to this blog, but based on what I can find in my own notes and archives, I probably published my first post on August 26, 2001 . So, I'm going to call that the birthdate of Spam Resource, and that means that today…

Need a fake SMTP server for testing? Chadwan Pawar of PostBox Services suggests Mailhog . It's an open source SMTP server that captures all mail and gives you a visual dashboard showing you what was received. Much fancier than /dev/null (but that can come in handy sometime…

The question, “Why does Microsoft hate me?” is something I hear a lot lately. I’m not sure Microsoft actually hates any of you, but it’s clear that many senders are frustrated with how difficult it seems to be to be able to get mail delivered to Microsoft OLC (Hotmail/Outlook.c…

It's been a while since I've posted a BIMI status update, and things are changing! Things are standardizing! Things are getting good. So, let's get right to it...

Verifying email addresses through methods akin to what we now think of as confirmed opt-in (COI) or (DOI) isn't a new thing. Mailing list software Majordomo  added support for verifying new signups  way back in 1996. I don't remember exactly when it became common to va…

Are you looking for an open source sending MTA solution? For big senders, commercial MTA platforms like PowerMTA or MailerQ are usually the way to go. But for those of you looking for an alternative, ZoneMTA might be something for you to check out. Over on the Mailop list, le…

Microsoft's SNDS (Smart Network Data Service) portal is a free and valuable deliverability resource for senders, providing direct data and feedback regarding your sending reputation. It also allows you to configure JMRP (Junk Mail Reporting Program), the Microsoft version o…

The linux/unix tool  mb2md  does one thing and it does it well: It takes and "mbox" mailbox file and converts it into Maildir files. In " mbox " mailbox format, your entire mailbox is one file. Each message is delimited with a blank line and the next line st…

Are you running into this error message when sending to users at AT&T/SBCGlobal email domains ?  <(user)@sbcglobal.net>: host al-ip4-mx-vip2.prodigy.net [144.160.235.144] said: 550 5.7.1 Connections not accepted from servers without a valid sender domain.xxx123 Fix r…

Inbox monitoring and email validation tools vendor Validity has partnered with our friends behind the Spamhaus blocking lists to educate senders -- "formalizing a longstanding relationship in which Validity and Spamhaus have united under a singular vision to encourage bet…