Delivery addons are bridges between Newsletter and external professional email delivery services. Those services are specialized on email delivery and grants reliability, up-time, speed and bounce checking.
Once a delivery add-on is installed, configured and enabled, Newsletter starts to deliver emails with the connected service. Every service allows a different speed based on the plan you choose and offer different features.
The services listed below are all integrated using their API. It enables better speed than using an SMTP services and less problem with provider which blocks connections at firewall level.
Other services can be used, if they provider an SMTP access. In that case we suggest to install an SMTP plugin for WordPress. Please note that some hosting provider block connection to external SMTPs.
You need an account (but it’s easy)
To connect to a service, you need an account om that service. Usually you can signup for free to explore their features and even send a number of emails for free.
Following our instructions (specific for every service we integrate – see our documentation), you can generate the required API keys to complete the connection. You can then test the integration even before enabling it to check everything is working as expected.
Test twice (or more)
Once configured the add-on test some delivery at different email addresses and when possible check them on the service console (not available on Amazon SES). You should see the test message on their console and a status (delivered, queued, bounced and so no). If the message appears on the service console, but is actually not delivered, you need to contact their service support.
Bounce is a word to indicate an email address is not reachable (missing mailbox, full mailbox, and so on). Getting the “bounced addresses” from the delivery service, Newsletter is able to keep the contact list as clean as possible, setting invalid contact as “bounced”.
Every integration has the bounce checking.
Can we recommend a specific one?
No, all services we integrated were, at the time of integration, very valuable. If you want to send a great amount of emails (more than 50,000 per run) we can suggest to use Amazon SES. It is cheaper but has a very very limited console.
What is the “turbo mode”
When possible we offer the ability to activate a special working mode which sends more emails in a row to increase the throughput. We cannot grant it will work on every hosting, so use with care and start with a low number of parallel engines, for example 2. Usually on VPS there are not problem at all to use even 5 or more engines.
If I use 5 engines, can I send a 5x rate?
No, usually the speed increase is not so proportional, for a number of technical reasons. But you should see an important increase, anyway.
When I do a test with turbo mode active I don’t get constant speed reports
It’s ok, there are a number of factors influencing the actual speed on a simple test. The reported values are only indicative. A more precise statistical speed computer over many more deliveries is reported in the Newsletter status page.