The Postmastery Blog: Insights, Tools & Best Practices for Email Deliverability
Email domains best practices
2013/02/08 by Maarten Oelering.
Email domains are important for identification, trust and reputation. But emails can embed many domains used for different purposes. They are listed below: IP hostname Envelope sender domain From header domain Reply-To header domain Sender header domain Message-ID domain DKIM signing domain Image URI domain(s) Link URI domain(s) This post provides some background on these […]
Categories: Authentication, Deliverability, General
SFR incoming email authentication
2012/03/23 by Jérôme Gays.
With the growing strength of phishing campaigns, incoming message authentication has become an important issue for ISPs to protect their users. Various standards exist to authentify outgoing email messages. Since September 2011, SFR has decided to verify the authenticity of incoming emails according to SPF standard and might be thinking of an upcoming implementation of […]
Categories: Deliverability, General
DMARC: A new standard for domain protection
2012/02/16 by Jérôme Gays.
SMTP protocol is old and easy to use. It was invented before 1980 to enable email sending to private networks. Thanks to the native SMTP protocol, it is possible to send an email using the desired sender address, but this option has also created electronic communication reliability issues as, in particular, the development of phishing […]
What DMARC means for you
2012/02/07 by Maarten Oelering.
A week ago DMARC went public causing a tidal wave of publicity, discussion, and fuzz. Many senders are now asking what they should do with it. In this post I will try to put things in perspective, so senders can judge better what it means for them. First of all, DMARC is not something completely […]
Categories: Authentication, DMARC, General
Email Service Provider versus In-house
2011/11/06 by Maarten Oelering.
A common question among professional senders is: should I use an Email Service Provider (ESP) or can I send my emails in-house? To find a good answer can be difficult. There are a lot of ESPs and a lot of software vendors ready to help you, but where to get objective advise from? My customers […]
Categories: Authentication, General, Providers, Solutions
Orange protects its Messaging Infrastructure with Cloudmark Antispam Solution
2011/01/14 by Jérôme Gays.
Since November 15th, Orange has implemented Cloudmark Antispam Solution in order to protect its messaging infrastructure. As quoted on Cloudmark site, Sylvain Causse of France Telecom/ Orange points out: « We selected Cloudmark Antispam Solution considering their expertise and experience in the message security industry, and the high performance and flexibility level of the solutions […]
Categories: Authentication, General
On the classification of bounces
2010/07/07 by Maarten Oelering.
Delivering large volumes of email can be difficult. Properly handing the bounces can be even more challenging. To decode, analyze and classify the hundredths of different bounce mail formats is a complex task. To give you an idea what you might encounter, here are some examples of bounces: 421 4.7.1 Intrusion prevention active for [X.X.X.X] […]
Categories: Authentication, Deliverability, General