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Hi! Just received this message when logging into Mailgun. Will this affect your plugin at all with Mailgun or should we be good?
IP ranges are changing for API endpoints and webhooks domain starting June 6, 2022
Mailgun will soon begin migrating its infrastructure from Amazon Web Services (AWS) to Google Cloud Platform (GCP). During this transition, additional IPs will be added for both our API endpoints and for origination of the webhooks we post to customers.
What this means for you:
If you are currently restricting outbound connections to our API endpoints to AWS IP addresses, you could possibly see errors or connection timeouts when trying to connect to these new addresses. Likewise, if you utilize webhooks and have restrictions on the originating IPs, you will not receive webhooks for messages processed in a GCP region.
Our environment's security and DNS settings result in IPs constantly rotating. As such, we can only support connections made to our hostnames (api.mailgun.net and smtp.mailgun.org) - rather than any particular IP - for message sending and API usage. Similarly, the IP addresses we use to originate webhook connections also rotate. As such, whitelisting a particular set of IPs is not supported and likely to result in failed webhook deliveries.
Action needed:
If you are utilizing API endpoints or webhook origination, please ensure there are not any firewall or system filtering rules based on IP address.