What to do if you do not receive email from HRBC

What to do

Before starting to send emails from HRBC, please make settings to“block spoofing”.


Emails sent from HRBC are sent with the HRBC domain which is changed to the user's email address.

“Spoofing” means that the sender's email address (user's email address) domain is different from the HRBC domain and the recipient concludes that the sender has been impersonated and treats the email as spam.

In recent years, heavy countermeasures have been put into place by mobile carriers, mail services etc to deal with spam mail and their are tougher criteria to deem an email as spam mail, therefore we strongly recommend that you take this action.


In addition, when an email is considered junk mail, whether to enter it in the junk mail folder or to block receipt depends on the settings on the server and mailer on the receiving side.

In general, when email transmission is successful but the email is not delivered, there are various causes such as network, server, mailer settings, etc. The following measures can be taken to reduce email delivery failure.

DKIM(DomainKeys Identified Mail) as from 2019/10/31

By default, third-party signature (settings for Return Path) is supported, but if requested by the customer, author signature (settings for From) is accepted.


The flow for setting DKIM for customer's 'From' is as follows.

※Since there are some settings to be made by Porters and others by the client, we request that you make your application giving adequate time.


1.Client shall apply by email providing the domain and company ID.

The following is an email template. Please copy and enter the necessary information.

To:HRBC Support hrbc-support@porters.jp

Subject:DKIM(Author Signature)Application
DKIM (Author Signature)

Company ID:○○
Company Name:○○
Your Name:○○
Email address:○○


※If there is more than one, please list them

2. Porters will issue a dedicated key for your domain and contact you about the same.

3.Customer sets the key on the DNS server. (Customer will set the key provided by Porters on DNS server)

4.Customer shall contact Porters after setting the key.

5.Porters will send a test email.

6.Porters will inform the client when the settings are complete.


Recommend your to make settings to allow receiving emails from your company's domain

Please instruct the email recipients to make settings to enable emails from the sender's domain to be delivered.

You may be able to receive even the emails sent from HRBC.


Add an SPF record reference for HRBC domain "porterscloud.com" to your SPF record.

※It is necessary to check with the person in charge of email matters in your company then make the required settings.

There is a possibility that you can avoid cases of emails being considered impersonation by setting the SPF record of your mail server to refer to the SPF record of HRBC domain.

Since the IP of HRBC may change due to maintenance etc., please set the domain reference of “porterscloud.com”.

  Example:  include:porterscloud.com

   ※If there were other settings originally, please check the details before making this setting.


When sending email from HRBC, the original sender email address is “no-reply@porterscloud.com", however,“From” is set to the user email address “xxx@xxx.co.jp”.

The above sender “no-reply@porterscloud.com” is called 'envelope From', and the user address in From is called 'header From'.

Normally, the 'envelope From' SPF record is checked in order to determine junk email. If there is a source IP and SPF record, it is judged as normal email, and if not, it is judged as junk mail (spoofing).

When mail is sent from HRBC, the source IP is the IP of HRBC, so it is usually judged as normal mail, but there is a possibility that it is judged as spam when the security setting on the receiving side is set to high.

In addition, it is easier for an email to be identified as spam if the recipient previously reported that the address is spam.


Please note that every mail service has its own standards for determining spam mail and these standards are not disclosed to the public and depending on the recipient's settings, email may not be delivered even if the above measures are taken.

We ask for your understanding.

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