SMTP Relays

SMTP Relays are third-party services that can deliver email on your behalf. They can be useful when, for example, port 25 is blocked, the cloud provider/ISP doesn't provide Reverse DNS, or the IP address has a low reputation, among other situations where deliverablity isn't great.

These services are governed by their own terms and as such limits can be imposed in the usage of those services.

Here, you can configure an authenticated SMTP relay and authorize it's associated servers to send mail for you.

SMTP Relay Configuration

:

If you've already set up a relay before on this box, you can leave this field blank if you don't want to change it's password.

Authorized Servers

The relay service should specify the servers where the email will be sent from, please add them below. These will probably be published in the form of a SPF record. Failure to do so will potentially have your email sent to spam or even rejected altogether by recipients.

You can use the button below to attempt to localize the SPF record associated with the service you're using.


Add your SPF configuration/authorized servers here

You can separate multiple servers with commas or spaces. You can also add IP addresses or subnets using 10.20.30.40 or 10.0.0.0/8. You can "import" SPF records using spf:example.com.

DKIM Configuration

DKIM allows receivers to verify that the email was sent by the relay you configured (this is, somebody you trust). Not doing so will have your email sent to spam.

._domainkey.{{hostname}}

Paste the DKIM key here:

After configuration

By that time you should be good to go. If your relay provider provides their own custom DNS verification methods, feel free to publish them on DNS.