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discussion There’s something about bounces

I’ve shared a version of this image repeatedly. I think it was only my Facebook friends that got the stick figure screaming in frustration, though. An overlapping circles diagram showing bounce classifications from 3 different ESPs and how they overlap (and don't) with each other and with my classifications of the underlying error. The reality is bounce handling is one of the most frustrating pieces of email delivery. Not only that, many people in the email space treat it as a simple process. It’s [...] [more]
wordtothewise.com    Deliverability

tactics Alt-text and phishing warnings

For a long time one of the “best practices” for links in html content has been to avoid having anything that looks like a URL or hostname in the visible content of the link, as ISP phishing filters are very, very suspicious of links that seem to mislead recipients about where the link goes to. They’re a very common pattern in phishing emails.… [...] [more]
wordtothewise.com    Deliverability

discussion Barracuda update

The Barracuda twitter account has been very helpful and responsive to the issue. A few hours ago they tweeted that the problem should have been fixed. Reports are that listings are resolving and [...] [more]
wordtothewise.com    Spam, Deliverability

discussion Recycled spamtraps

Spamtraps strike fear into the heart of senders. They’ve turned into this monster metric that can make or break a marketing program. They’ve become a measure and a goal and I think some [...] [more]
wordtothewise.com    Deliverability

antispam Check your abuse addresses

Even if you have excellent policies and an effective, empowered enforcement team you can still have technical problems that can cause you to drop abuse mail, and so lose the opportunity to get a [...] [more]
wordtothewise.com    Spam

antispam Minimal DMARC

What if your recipients have been happily forwarding the mail you send to them to internal mailing lists and alternate accounts and so on for decades? And that forwarding is the sort that’s likely to break DKIM signatures as well as break SPF? And while everyone would advise you not to deploy DMARC p=reject, or at least to roll it out very slowly and carefully with a long monitoring period where you watch what happens with p-none, you have to deploy p=reject real soon now? [...] [more]
wordtothewise.com    Spam, Deliverability

discussion Who are mimecast?

Mimecast is a filter primarily used by businesses. They’re fairly widely used. In some of the data analysis I’ve done for clients, they’re a top 10 or top 20 filter. Earlier today someone asked on Facebook if mimecast may be blocking emails based on the TLD. The short answer is it’s unlikely. I’ve not seen huge issues with them blocking based on TLD of the domain. They’re generally more selective than that. [...] [more]
wordtothewise.com    Deliverability

discussion UCEProtect and GDPR fallout

First thing this morning I got an email from a client that they were listed on the UCEProtect Level 3 blacklist. Mid-morning I got a message from a different client telling me the same thing. Both clients shared their bounce messages with me: 550 Conexion rechazada por estar o167890x0.outbound-mail.sendgrid.net[167.89.0.0]:56628 en la DNSBL dnsbl-3.uceprotect.net  [...] [more]
wordtothewise.com    Deliverability

discussion Widespread Microsoft phishing warnings today

Multiple people have talked to employees inside Microsoft, and I suspect their customers have been blowing up support about this. I know they’re aware, I suspect they’re frantically working on a fix. Update 11 am PDT: It appears this filter is firing when mail has the word “hotmail” in it. This includes if non displaying text (like CSS) has the word in it. It feels like they were attempting to mitigate something and wrote a rule that wasn’t quite right. Still no word on a fix, but don’t panic. [...] [more]
wordtothewise.com    Deliverability

discussion How long does it take to change reputation at Gmail?

Today I was chatting with a potential client who is in the middle of a frustrating warmup at Gmail. They’re doing absolutely the right things, it’s just taking longer than anyone wants. That’s kinda how it is with Gmail, while their algorithm can adapt quickly to changes. Sometimes, like when you’re warming up or trying [...] [more]
wordtothewise.com    Deliverability

discussion What does good IP Reputation get you?

IP Reputation Still Matters, a little. This doesn’t mean senders can, or should ignore IP reputation. Even Gmail looks at IP reputation a little bit. The place IP reputation is primarily used during the SMTP transaction. Good IP reputation does lead to less rate limiting. Senders with good IP reputation can send more mail faster than senders with poor reputation. But once the SMTP transaction is over, IP reputation is just a small factor in a large pool of variables. [...] [more]
wordtothewise.com    Deliverability

discussion Microsoft using the List-Unsubscribe header

An interesting observation from Brian Curry about how Microsoft is using the List Unsubscribe header in their interface. The short version is that Microsoft is only supporting mailto: links. They’re ignoring any List-Unsubscribe links that are a URL. Here are some screenshots. When the sender is using a List-Unsubscribe http:// header, Microsoft states that there is no information on how to help the user unsubscribe, so the offer to block the sender instead. Like in these two messages. [...] [more]
wordtothewise.com    Unsubscribe, Marketing, Deliverability

antispam About that DMARC "exploit"

A security researcher has identified a rendering flaw that allows for “perfect” phishing emails. From his website: Mailsploit is a collection of bugs in email clients that allow effective sender spoofing and code injection attacks. The spoofing is not detected by Mail Transfer Agents (MTA) aka email servers, therefore circumventing spoofing protection mechanisms such as [...] [more]
wordtothewise.com    Spam, Deliverability

discussion Spike in Yahoo error codes

A number of people have mentioned over the last couple weeks that they’re seeing a spike in Yahoo rejecting mail with "554 delivery error: dd Requested mail action aborted". Discussions on various mailing lists indicate these messages are related to inactive accounts. Addresses that bounce at Yahoo with these codes should be handled as inactive addresses and removed from future mailings. [more]
wordtothewise.com    Deliverability

discussion The feds are deploying DMARC

The US National Cybersecurity Assessments & Technical Services Team have issued a mandate on web and email security, including TLS+HSTS for web servers, and STARTTLS+SPF+DKIM+DMARC for email. It’s … pretty decent for a brief, public requirements doc. It’s compatible with a prudent rollout of email authentication. Set up a centralized reporting repository for DMARC failure and aggregate [...] [more]
wordtothewise.com    Deliverability
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