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antispam Massive Cyberattack Aimed at Flooding .Gov Email Inboxes With Subscription Requests

"Massive Email Bombs Target .Gov Addresses," Brian Krebs writes in Krebs on Security: "Over the weekend, unknown assailants launched a massive cyber attack aimed at flooding targeted dot-gov (.gov) email inboxes with subscription requests to thousands of email lists. According to experts, the attack — designed to render the targeted inboxes useless for a period of time — was successful largely thanks to the staggering number of email newsletters that don't take the basic step of validating new signup [...] [more]
circleid.com    Listbuilding, Spam, Deliverability

discussion Marketo's Path to Being Acquired

Happy Early Memorial Day. Once an ESP or marketing automation company declares itself for sale, there seems to be a mass exodus by investors, which sends up a red flag, (well in this case, a red & white striped flag). This past week there were rumblings about the potential suitors for Marketo. While it is rumored that German company SAP is the front-runner, there are many other potential suitors circling the marketing automation software company. [...] [more]
circleid.com    ESP

antispam DKIM for ESPs: The Struggle of Living Up to the Ideal

Major ISPs (Gmail, Yahoo! Mail, Outlook, etc.) are pushing other senders to authenticate their email and are using a carrot/stick approach: Do it well, and your email gets through with high deliverability rates. Authenticate poorly, and your email will be downgraded with lower deliverability — and increasingly with warnings or a lack of graphics and identifying logos. [...] [more]
circleid.com    Spam, Deliverability

antispam Email Authentification: What's ARC?

Last week the DMARC group published a proposal called ARC, for Authenticated Received Chain, that is intended to mitigate the damage. What is it, and how likely is it to work? When the DMARC list problems started last year, a frequently proposed workaround was for receivers to whitelist mail from known lists. Large mail providers already have a pretty good idea of where the lists are, so this would be relatively simple to do. Smaller systems might combine their data into shared whitelists. But this [...] [more]
circleid.com    Spam

antispam Who Is Sending Email As Your Company?

You might expect that the IT department or security team knows who's sending email using your company's domains. But for a variety of reasons these groups are often unaware of many legitimate senders -- not to mention all the bad actors. Fortunately you can get a more complete view by using DMARC's reporting features. How does it happen? Product teams managing a new product launch or customer survey hire marketing consultants and Email Service Providers (ESP)[...] [more]
circleid.com    Spam

antispam When DNSBLs Go Bad

I have often remarked that any fool can run a DNS-Based Blacklist (DNSBL) and many fools do so. Since approximately nobody uses the incompetently run black lists, they don't matter. Unfortunately, using a DNSBL requires equally little expertise, which becomes a problem when an operator wants to shut down a list. When someone sets up a mail server (which we'll call an MTA for Mail Transfer Agent), one of the tasks is to configure the anti-spam features, which invariably involves using DNSBLs. [...] [more]
circleid.com    Spam, Deliverability

 discussion Yahoo Addresses a Security Problem by Breaking Every Mailing List in the World

DMARC is what one might call an emerging e-mail security scheme. It's emerging pretty fast, since many of the largest mail systems in the world have already implemented it, including Gmail, Hotmail/MSN/Outlook, Comcast, and Yahoo. DMARC lets a domain owner make assertions about mail that has their domain in the address on the 'From:' line. It lets the owner assert that mail will have a DKIM signature with the same domain, or an envelope return (bounce) address in the same domain that will pass SPF [...] [more]
circleid.com    From, Deliverability

antispam How Spam Has Damaged Mail Forwarding - And Ways to Get Around It

Rather than just closing the account, the mail system forwards all the mail to the user's new address. Unfortunately, forwarding is yet another thing that spam has screwed up. If you just forward all the mail that arrives at a typical address, most of what you'll be forwarding is spam. From the point of view of the system you're forwarding to, you're the one sending the spam, and they're likely to block you. Fortunately, there are some ways to mitigate the damage. [more]
circleid.com    Spam, Deliverability

 antispam Dave Crocker: Searching Under Lampposts with DKIM

Email is a complex service and email abuse adds confusing deceptions. Worse, like postal mail and even telephone service, Internet mail is inherently open, flexible and even anonymous, making things much easier for abusers. Bad actors hide their true identity and their true purpose. Most other communication tools for users also are also quite open, and problems with email are being replicated elsewhere, such as instant messaging and social media. [...] [more]
circleid.com    Deliverability
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