Email Authentication: SPF, DKIM, and DMARC Best Practices
Gmail’s wide deployment of TLS
2016/02/22 by Jérôme Gays.
When talking about authentication and encryption technologies —such are SPF, DKIM, DMARC—, Gmail has always been at the cutting edge of the topic. After having implemented Google Postmaster (read our related article), it is therefore possible to monitor the percentage of Google’s outgoing and incoming emails TLS encrypted or not. Announced by Google last week, […]
Categories: Authentication, General, PowerMTA
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
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
Why I chose a commercial grade MTA
2010/01/01 by Maarten Oelering.
For sending emails, there is a wealth of solutions. On the open source side, there is Sendmail, Qmail, Exim and Postfix. Then there are a number of commercial MTAs available, at different price levels. The most well known vendors are Message Systems, Port25 and StrongMail. Postfix is a popular open source MTA thanks to it’s […]
Categories: Authentication, General, Postfix, PowerMTA