If your company uses Mimecast or similar email security services that try to decide if email content is spam, phishing or similar and blocks it as a result, you might find that emails sent from Passle are not being received. This happens when the email management software decides that because they are coming from an unknown source for your domain, they should be blocked.
In order to resolve this issue, you will need to configure your email service to "allowlist" Passle as a permitted sender.
Exactly how you configure the software or service can vary depending on the provider you use, so we can’t provide general instructions. However, this page aims to provide you with the technical information that we believe you will need. Hopefully, your IT team will know what to do with this information, but if there are any problems then please do contact us.
Most filters work on "From" or "Sender" addresses, if your internal network blocks your users from receiving email from certain domains, or sends email from those domains to a spam folder, then please ensure the following domains (including all subdomains) are allowed:
Our SMTP Server (which outbound emails are sent from), IP addresses are,
- 18.104.22.168/27 (22.214.171.124 - 127)
- 126.96.36.199/26 (188.8.131.52 - 255)
- 184.108.40.206/24 (220.127.116.11 - 255)
If you need any other information, please get in touch via email@example.com and we will do our best to help make sure you have everything you need to ensure reliable delivery of your emails and access to Passle domains.