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Port25 2017 European Summit

Port25 and Postmastery are pleased to invite you to the Port25 2017 European Summit

Don’t miss out on this yearly event for people in the world of high volume email delivery. Hear expert speakers from Port25, Postmastery and other companies cover the most topical issues and get all your questions regarding delivery, control, metrics and reputation management of high volume email answered during this informative and pleasant day.


Tuesday 19 September, 2017
09:00 | light breakfast
10:00 | welcome address & sessions
12:00 | lunch
13:00 | sessions
17:00 | post-event reception


Turning Mail Server Logs into Delivery Intelligence
Case Study: Moving from Postfix to PowerMTA
PowerMTA and PMC Engineering Report & Roadmap
Survey of Global ISPs
PowerMTA Configuration Advanced Tips and Tricks
Customer Feedback Roundtable


Kimpton De Witt Hotel Amsterdam
Nieuwezijds Voorburgwal 5
1012 RC Amsterdam


€ 189 – only a limited number of seats still available

Find new ways to address your email deliverability challenges, manage your email reputation, and drive growth and engagement for your business. The 2017 Port25 European Summit presents the opportunity to learn from your peers, meet the technology leaders, and share your experiences in and around the Port25 ecosystem.

Register here

Postmastery and DeliverNow Announce Merger

Amsterdam, The Netherlands and Paris, France – May 9, 2017

Postmastery BV (“Postmastery”) and DeliverNow Inc. (“DeliverNow”), leading providers of email deliverability solutions and services, today announced the merger of the two companies. The merger is effective today, and the companies will combine business operations in the coming year. The combined company will be privately held and operate under existing brands.

Over the past years, DeliverNow and Postmastery have delivered some of the most innovative and successful email deliverability solutions and services addressing the needs of high volume email senders across the globe. These solutions and services cover the full spectrum of the email delivery lifecycle including the sending infrastructure (such as PowerMTA), email security (DMARC) and deliverability monitoring and optimisation services and tools.

“We celebrate this milestone today as we merge with our highly-regarded French peer, DeliverNow,” said Maarten Oelering, co-founder and CTO of Postmastery. “Combined under the Postmastery umbrella, we will draw on our extensive email delivery experience to push the boundaries of email deliverability innovation and remain focused on delivering outstanding technology, capabilities and service to the email industry.”

“Postmastery and DeliverNow have been working together on several projects in the past, This merger is a perfect fit since DeliverNow and Postmastery perform similar activities, but so far in different countries.” said Jerome Gays, founder of DeliverNow. “There is an incredible opportunity to upgrade and expand our combined email delivery monitoring tools and knowledge in the email delivery industry.

Combined, the companies will become the undisputed European market leader with approximately 200 customers in more than 30 countries and having monitored over 5 billion emails each month’s through their email deliverability monitoring tooling.

About Postmastery

Postmastery is helping legitimate email senders to be recognized as a sender which should be trusted and its’ emails delivered to the inbox. Postmastery is based in Amsterdam, the Netherlands. Their world-wide client base includes e-mail service providers (ESP’s), marketing agencies and other professional senders. Postmastery is global implementation partner of Port25 in providing PowerMTA licenses, integration services, local support and delivery optimization services. For more information, please visit, or connect with Postmastery on Facebook, Twitter or LinkedIn.

About DeliverNow

DeliverNow is an independent deliverability company based in France since 2010. DeliverNow helps emails senders to deliver emails in the recipient’s inbox in respect of the ecosystem best practices by offering deliverability monitoring tools and services to the european email market. DeliverNow have develop DMS (Deliverability Monitoring Suite) a deliverability monitoring solution based on Splunk to help senders having a real-time view on their email deliverability performances.

More informations :

Willem Stam – Postmastery –
Jérôme Gays – DeliverNow –

Why to choose PowerMTA for in-house email deliverability?

client03So you decided to take the path of in-house deliverability (see our article regarding this topic), but there is one more thing to think about: Which is the sending solution to pick out from the others?

By DeliverNow, we made up our mind and decided — as well as becoming both an authorized retailer and integrator  — to privilege PowerMTA; a Port25-edited solution since 1999.
PowerMTA currently enables most of the biggest international ESP; it is a rock-solid solution, which had succeeded all tests (see ‘Port25 in figures’ infography)

If we have decided for the PowerMTA implementation (we could have chosen a free solution like Postfix, for instance) it is because we want to provide our customers with its richness and expertise in the deliverability management arena. Port25 follows with excellence the latest trends regarding deliverability and keeps itself at the pinnacle of innovation.

Authentication and data flows management.

DomaineKeys-helped email authentications as well as DKIM standard have become an essential factor in order to grant the safety of your emails throughout their sending. With PowerMTA on your side you are a 100% sure of the quality of your outgoing emails. Using the ‘Guaranteed Authentic’ mode your queued email signature matching is analyzed and warnings are set off in case of failure.

On top of the authenticating management, the Port25-edited MTA enables you to manage an unlimited IP addresses number divided among the different virtual MTA. Being this flexible, you are able to chirurgical-manage your sending infrastructure. For instance, if you have to manage an uneven email flow, you would have the opportunity to assign different resources such as IP addresses, sending speed, simultaneous connection, bandwith, etc…, according to the importance attached to each message category.


Connectivity management.

Deliverability is rocket-space science; each destination — Webmails or ISP — requires specific settings. Regardless of the sent emails number per minute, the e-reputation evolution speed or the number of simultaneous connections, every single one of them has its own process. Because of this, PowerMTA provides you the possibility of achieving extremely precise connectivity settings.

One clear example is adapting the below-listed different settings by domain/destination:

  • Number of simultaneous connections.
  • Sent messages per connection.
  • Sending attempts per hour.
  • ‘Retry’ maximal length.
  • Authentication procedures.

As we said before, all this settings may be adjusted through virtual MTA’s. For instance, for the AOL destination, you will enable twice the simultaneous connections for your transactional emails, hence granting you much faster confirmation-email deliverability (and let’s face it, they are a key factor for businesses) than that of your newsletters.

Deliverability follow-up.

The first advantage of the PowerMTA-based deliverability follow-up is that it enables you to explore an utter SMPT log file. It is a key factor that once you have mastered it, it will allow you to deeply analyze the source of any upcoming deliverability failure.

On the other hand, PowerMTA will tool you up to follow your deliverability by destination, campaign or virtual MTA:

  • Real time bounces classification.
  • Statistic-analyzing tools in command line.
  • Web-interfaced stats board.
  • Multi format log export management (XML, CSV, HTML, etc).
  • API empowering you to connect your logs to your own analyzing system.

This solution includes built-in main feedback loops in order to efficiently manage the user’s spam complaints.

Customizing and integration.

Far beyond your email deliverability, PowerMTA presents a wide range of solutions in order to perform a do-it-your-way email managing. Plus the classic SMPT relay and file drop-off into directory, many API have been developed, enabling you to send your messages regardless of the ongoing programming language (C, C++, C#, Java, Perl,…).

To this rather flexible message-sending processes are added data-merging features in order to customize your messages and to reach your marketing members expectations.

30-day free PowerMTA trial.

Talking about performance, PowerMTA is selled into 2 versions: standard and business. Standard version enables you to send 100 000 emails per hour, while the business version may go up to 1 000 000 emails per hour.

DeliverNow proposes a 30-day free PowerMTA trial. Check out yourself the flexibility and performance of this tool before taking the decision of its integration for good.

Want to know more about different model’s licenses and integration solutions — install, settings, start-up — proposed by DeliverNow, do not hesitate to contact us.

Deliverability – In-house or outsource: pro’s and con’s

slideshow-01Deliverability has always been a key factor for all enterprises using email marketing. During the past few years, the subject has become harder and harder to deal with: phishing increase, more offensive anti-spam filters, smart inboxes, email listing globalization, etc. Opportunely, both the IT and marketing managers are becoming more aware on these subjects.

However, even if they are plunged into the deliverability topic, marketers are often disarmed facing some crucial matters. One of these big questions is: Shall routing be in-housed or outsourced in order to keep utter control over deliverability?

Let’s intend to clarify the advantages and disadvantages of both policies.

Outsourcing your routing: less work but less control.

Let’s start talking about the advantages of an outsourced deliverability. ESP’s main objective is to send emails; hence expertise is fundamental: all of the ESP’s must lead to this goal. With this in mind, the whole ESP infrastructure will adjust to react to the market’s evolution. Plus it will be updated to the current standards faster than you would do it yourself.
A good illustration of this is the recent shift of the Gmail images display, which had broken some ESP’s ability to track opens. In this particular scenario, just a couple of days were needed in order to update their infrastructure; you may not get the same outcome with an in-house solution.

Even though, outsourced routing may carry some inconvenient as well.
On top of the list being probably the most important is the lack of experts. ESP’s can rarely count more than one or three deliverability managers devoted to the implementation, management, monitoring and deliverability analyzing. Now let’s do the math— considering your router customer’s number, try to guess how much time a deliverability manager would devout to you. Most likely it would be less than an hour per month; in other words nothing… and less than nothing when problems come up.

When you employ a database for marketing, this becomes your most precious asset. Time and means invested to settle a trustworthy relationship with your customers are priceless. Therefore, this is why you should pay attention to whom you thrust your database when outsourcing, even if there is always a good reason for doing it. When deliverability is outsourced, not only you are revealing your email listing, but also all messages and behavioral data sent through them— and let’s not forget it is precisely that what makes your business valuable.

A shift in the marketers’ practice: multipath delivery.

By facing increasingly deliverability failures, unevenly handled according to ESP’s, marketers are trying to take control over their deliverability in different ways. The first one: to be up-to-date and highly trained. An increasing number of email senders are striving to get the most knowledge possible to decipher their ESP’s outgoing data.

Unfortunately, teams are not always enough trained, leading them to build their own shields. One of these is multipath delivery, which is basically to use several routers at a time either to have a lifesaver when downfall of the main router or just to mutualize several platforms. Thus, it is now usual to find marketers withstanding 2,3 or even more routers simultaneously.

Nonetheless the question remains: is multipath delivery actually improving deliverability? The answer: multipath delivery is far away from being a permanent solution. Since it will not solve deliverability failures from the source, in the best scenario it will improve deliverability temporarily— in the worst one it will lead to a sustainable drop of your reputation.

In-house email delivery: investing for the future?

Our last candidate is the in-house email deliverability procedure. Here we meet again some of the outsourcing disadvantages such as lack of experts. However, former-outsourcing budgets such as license, integration and emailing cost, may now be used in order to train the IT managers, turning them into deliverability experts.

Hard to believe, one of the main flaws of in-house routing is binded to its main advantage. In-house deliverability implies self-administration of all data comprising security and email address management. Even if it suggests an overhead work, it will reduce the amount of intervinients intruding your routing process.

In-house routing deliverability means total independence of the ESP’s reputation, furthermore it means utter disconnection with all of the others ESP’s customers reputation.

By employing your own infrastructure, domain and IP address range, you are a 100% responsible of your email sender reputation: no one will be messing with your business!

Regarding the possible deliverability failures; in-house routing enables you with overall power. Technical words here: an email is a SMTP dialogue between two servers: HELO, MAIL FROM, RCPT TO, DATA. At each stage of the SMTP dialogue, failures may pop out and reaction to them is often explicit. Mastering your SMPT server allows you to acknowledge the exact reason of the failure and then to fix it. It is quite an advantage compared to an ESP, which will gather the many SMTP codes into less intelligible categories: hardbounces, softbounces and spam filters.

Plus, through real-time deliverability monitoring, you may be much more reactive to failures.
Dependence when having a failure will ineluctably slow down your process, especially if you do not have the proper monitoring tools.

In-house deliverability is not a miraculous recipe that will shield you against incoming nasties, but if deliverability is crucial for your activity, you should require all your inner resources to master it. The less outsourcers, the less time spent on solving problems.