Configuration of Outbound E-mail
By default any e-mail messages generated by the platform will come from our servicebuilder.co.uk domain. These messages will be signed with our DKIM signature, pass SPF checks and offer a good level of deliverability.
However, you may wish to have e-mails originate from your own domain so that they are recognisable by the recipients.
Preferred Method
Our preferred approach is to send e-mail directly on your behalf. In order for us to do this you will need to authorise our servers to do so by making the following changes:
- Adding our mail servers to your SPF record. To do this, please add “include:spf.servicebuilder.co.uk” to your existing SPF record. You should add this after any existing “include” statements and before the catch-all “-all” or “~all” statement at the end of your record.
- Adding our DKIM public keys to your DNS so that messages we send can be successfully verified by the recipient. This requires the creation of two CNAME records under the domain you wish to use for e-mail, as per the table below.
| Hostname | Type | Points to |
|---|---|---|
| pgl1._domainkey.yourdomain.co.uk | CNAME | mail._domainkey.servicebuilder.co.uk |
| pgl2._domainkey.yourdomain.co.uk | CNAME | mail2._domainkey.servicebuilder.co.uk |
Note that the DKIM records should be configured as CNAME (alias) records as the actual public keys are published directly by ourselves on our servicebuilder.co.uk domain. Use of the CNAME record allows us to rotate keys on a regular basis without requiring further DNS changes.
Once you have set up the appropriate CNAME records, please contact us in order for us to perform the necessary configuration on our servers. You can verify the creation of your DNS entries using online tools such as dnschecker.org.
If you decide to use a sub domain specifically for e-mail, such as mail.yourdomain.com, you will need to ensure you create an MX record, otherwise some mail servers will reject mail on the grounds that the sub domain does not exist. In such cases, create an MX record with a priority of 10 and point it to the mail server of your choice.
Alternative Method
Alternatively, you may wish us to route mail through your own servers so you can manage all outbound mail originating from your domain. To use this method, you will need to supply us with the details of your SMTP server including hostname, port, SSL/TLS requirements and any authentication details. Our technical team will work with you to complete the necessary steps.
We will initiate connections to your mail server from the following IP addresses, so please ensure they are allowed through your firewall:
- 52.56.122.75
- 18.135.177.105