Mail Relay on Documentation

Overview

Mon, 01 Jan 0001 00:00:00 +0000

The Elastx Mail Relay service facilitates sending large numbers of emails and is especially suited for applications/services that needs to send emails.

The scope of the service is access to our SMTP server for sending emails.

To use the service you must configure the necessary DNS records on the domain names you wish to use as sender address for your emails.

Announcements

Mon, 01 Jan 0001 00:00:00 +0000

2025-01-08 DKIM signing now required for all mail relay customers

Breaking changes

All mail relay customers are now required to implement DKIM signing for the domains they wish to use with our mail relay service. This can be as simple as adding a DNS record, please contact our support to get started. From 2025-04-01 our Mail Relay service will reject mails from domains without DKIM configured.

Background

Forged addresses and content are widely used in spam, phishing and other email frauds. To protect legitimate organisations and end users, more and more email providers are starting to reject mail sent without a valid DKIM signature.

Email and DNS

Mon, 01 Jan 0001 00:00:00 +0000

DNS plays a vital role in regards to email, there are three types of DNS records that are essential to ensuring your emails reach the recipients without being flagged as spam:

Type	Purpose
DMARC	Policy - what action should be taken if a email does not “pass” DKIM or SPF validation?
DKIM	Signing - each email is signed with a private key, the public key is put in DNS for the sender domain
SPF	Authorize email servers - what servers (source IPs) are allowed to send emails for this domain name

Additional reading

External resources that explains how DMARC, DKIM and SPF works:

FAQ

Mon, 01 Jan 0001 00:00:00 +0000

Price?

Please see the website.

How many emails can I send?

We recommend a maximum rate of 10 emails per second.

Multiple user accounts?

Yes, a couple of user accounts are fine.

Getting started

Mon, 01 Jan 0001 00:00:00 +0000

Overview

In short the required steps are:

Contact the Elastx Support to get user account and password for the SMTP server
For each domain you want to send emails from:
1. Create DNS record for Elastx challenge token (for each user account)
2. Create DNS SPF record
3. Create DNS DKIM record
4. Create DNS DMARC record

Once these steps are completed you can use our SMTP server to send emails.

If you are unfamiliar with SPF, DKIM and DMARC please see this article.