Overview
This article is for all users who need to ensure that emails and system communications from the ATS are delivered. It provides the required emails, server hostnames, and IP addresses to safelist (also called “whitelisting”), plus Office 365 ATP considerations, billing and support communication senders, optional integrations, and security details.
How To Safelist Emails, Server Hostnames, And IP Addresses
Follow the guidance and lists below to set up your email and network safelists.
Understand Safelisting Versus Adding Contacts
Adding an email as a “contact” is not the same as safelisting; safelisting must be done at the server level.
If your IT department has questions, they can contact our Support Team for assistance.
Important: Safelisting is configured by your IT team at the mail or security gateway. Adding a personal contact does not prevent filtering.
Office 365 Clients
You must safelist the server hostnames and email addresses below in your company’s Office 365 ATP account separately.
Office 365 Advanced Threat Protection has separate ATP Safe Links policies. Use Microsoft’s instructions here:
If changes are made in your O365 ATP account, you may need to re-safelist isolved Talent Acquisition.
Important: Changes to ATP Safe Links or Safe Attachments policies can override prior safelist settings. Reapply safelist entries after policy updates.
Required For ATS Functionality
Emails from the system are processed by Mailgun.
The specific sender email addresses are in the Emails section below; IPs are listed in the Server Hostnames and IP Addresses section.
Emails To Safelist
Server Hostnames And IP Addresses To Safelist
The following represent the same servers as fully qualified domain names (FQDN) and as IP addresses.
send.applicantemail.com.
o1.send.applicantemail.com.
mail.applicantemail.com.
send.applicantemails.com.
send.applyresponse.com.
send.hrfuse.com.
send.sourcingpro.io.
143.55.230.218.
143.55.230.94.
143.55.230.75.
159.135.237.217.
13.89.216.242.
Required For Billing And Support
Safelist the following to receive billing receipt emails and communications for sales and support.
BluBilling (payment processor for isolved Talent Acquisition products and services): https://applicant.blubilling.com.
Stripe (payment processor for in-app purchases like job board ads, text subscriptions, etc.):
Stripe.com.
dashboard.stripe.com.
HubSpot (sales and service communication software):
app.hubspot.com.
Required If Optional Integrations Are Enabled
Safelist the following only if the related integration is purchased on the account.
SelectiveHiring (assessment partner): email.selectivehiring.com.
Security Details
Are these server hostnames and emails SSL secure?
Emails do not apply to the HTTPS vs. HTTP distinction; the other items listed are hostnames, not HTTP nor HTTPS.
For email safelisting, most email hosts require whitelisted hostnames. Many email hosts already require HTTPS or TLS to send and receive emails.
The hostname’s purpose is so that, regardless of HTTPS or HTTP, the system evaluates that an email is coming from a whitelisted host.
If desired, clients can safelist these hostnames and then blacklist any HTTP traffic (usually port 80) or other insecure methods of email transport. Alternatively, they can specify only whitelisted TLS, SSL, or other secure mail ports (such as 443, 587, etc.).
The transports used support secure connections; configuration controls remain with the client’s IT team.
Reporting/Troubleshooting/Best Practices
If a user is still not receiving email:
Verify the email address is correct, including the correct domain suffix (for example, .com or .net).
Check the spam/junk folder. If the emails are there, mark them as not spam/junk.
Check with IT/server filters to confirm the address is not blocked at the server.
Contact our Support Team with the specific email address that is not working.
Verify that the applicable emails, server hostnames, and IP addresses listed above have been safelisted.
FAQs
Do I need to safelist items in Office 365 ATP separately?
Yes. Office 365 Advanced Threat Protection has separate Safe Links policies. Follow Microsoft’s instructions and reapply safelists if policies change.
Which items are required for ATS functionality?
Safelist the Mailgun sender email addresses and the server hostnames and IPs listed in the “Required For ATS Functionality” section.
Which items are required for billing and support communications?
Safelist BluBilling, Stripe (Stripe.com and dashboard.stripe.com), and HubSpot (app.hubspot.com).
Do I need to safelist optional integrations?
Only if purchased.
Are these hostnames and emails SSL/TLS secure?
The transports used support secure connections. Your IT team can restrict to secure mail ports (for example, 443, 587) and block insecure ports as desired.