SMTP Domain Validation

Authenticate the sending of your transactional emails via SMTP.

With your SMTP domains configured in Closum, you'll be able to generate credentials to be used to send emails from websites and online shops such as Wordpress, Woocommerce, Prestashop, Magento and others.

Each account can have up to 5 SMTP credentials.

SPF configurations

WHAT IS AN SPF RECORD?

SPF stands for "Sender Policy Framework". An SPF record is used to identify the Email servers authorised to send Emails from a particular domain and prevent other servers from sending fraudulent or spam Emails from that same domain. Although many DNS editors allow you to edit SPF records, it is recommended that SPF records be entered as a TXT record.

HOW TO CREATE AN SPF REGISTRATION?

If you're creating an SPF record, you'll probably see a form with at least the following two fields: "Host" or "Name" and "Value". And in these fields you must enter the following:

Host/Nome: @

(The @ symbol in the host or name field means that the record is pointed to your own domain. You'll find DNS editors that force you to enter the "@" symbol, some that force you to enter your own domain and others that don't allow you to enter anything at all. Each DNS editor is different and you may need to contact your hosting service provider for information on how to insert this record correctly).

Value: v=spf1 a mx include:s1-mail.closum.com ~all

Warning Check if there is already an SPF record in your domain's DNS. There can only be one SPF record per domain, so if one already exists, simply add include:s1-mail.closum.com to that record. For example, if the domain already has the record:

v=spf1 a mx include:_spf.google.com ~all

...just add it:

include:s1-mail.closum.com

the final record will look like this:

v=spf1 a mx include:_spf.google.com include:s1-mail.closum.com ~all

Updated on: 10/07/2025