Email Service Providers & Infrastructure Comparisons
Delivery issues at LaPoste.net resolved
2018/04/10 by Willem Stam.
On Friday April 6, 2018, Postmastery’s Email Delivery Analytics detected serious delivery issues at LaPoste.net. The most frequent SMTP errors we detected were: 421 4.3.2 No system resources 421 4.3.2 All server ports are busy 451 4.7.1 Service unavailable – try again later 421 4.7.0 lpn-prd-vrin0xx Error: too many errors 421 4.4.2 lpn-prd-vrin0xx Error: timeout […]
Categories: Deliverability, General, Providers
New SMTP replies at Outlook: update your backoff patterns to avoid reputation damage
2018/04/06 by Willem Stam.
On April 5th, at 5AM CET, we were alerted by a huge spike in Outlook deferrals. The chart below (copied from Postmastery Delivery Analytics) reveals the deferrals over time: After investigating the issue, Postmastery delivery engineers discovered new SMTP replies at Microsoft domains. These errors are receiver’s side, not related to sender’s reputation. Organization queue quota […]
Categories: Authentication, Deliverability, General, Providers
AOL and Yahoo merge could impact your email delivery and MTA
2018/02/26 by Willem Stam.
A few weeks ago, AOL reported that AOL and Yahoo will come together under the OATH umbrella and merge with the Yahoo email infrastructure to serve both brands. This happened on 20 February 2018, and now all the AOL recipient domains’ MX, including the following, will point to mx-aol.mail.gm0.yahoodns.net: – aol.com – verizon.net – aol.co.uk […]
Categories: Authentication, Deliverability, General, PowerMTA, Providers
Gmail introduces emails with lock
2016/04/06 by Willem Stam.
From now on computer users can see if their emails that go through Gmail are safe by Gmail lock. If so, the email has a special marking. For the time being, this service is only available in the United States. So there is lots of work to do for the companies that send huge amounts […]
Gmail: Feedback Loop and postmaster page, step-by-step configuration and set up
2015/09/05 by Jérôme Gays.
Google’s Gmail webmail has long been at the forefront of innovation. Where the Californian giant has especially distinguished itself from its competitors are in the quality of its spam processing and its successive ergonomic innovations such as tags, categorization of emails with tabs, unsubscribe button in the interface (list-unsubscribe) and so on. On the other […]
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