Which domains does MailMerge365 operate on and need to be whitelisted on firewalls?

The following domains are operated by MailMerge365 and used for the service:

It is not sufficient to whitelist just the IP addresses as our dynamic server scaling may result in changes to the IP addresses at any time (dynamic DNS).

In addition access to the Microsoft 365 (aka Office365) domains must be granted in order to authenticate with your Office365 account. Microsoft provides documentation on domains and IP addresses used for Office365.

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