Migration of Exchange environment from On Prem to Azure

BUDHADITYA BANERJEE 71 Reputation points

As cloud first approach, we are trying to migrate our on prem mail servers to Azure(We are not planning for O365 as of now for these email domains as of now). Due to lack of PaaS options is Azure as of now, best way will be to decommission the current on prem Infra including all the internal and external email servers. But as Port25 is disabled by default, can anybody suggest any tested and secured way to construct a High Available B2B Email infrastructure in Microsoft Azure? Please note, we will still be using the current on prem Internet and Intranet Domains for this Infra and we will have the On Prem Network and domain extension to Azure Subscription. Thanks.

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Accepted answer
  1. Michael Durkan 12,146 Reputation points MVP


    If you have an Enterprise Subscription, port 25 will not be blocked. However it is blocked by default on all other subscription types.

    You can review the details in the link below:


    Hope this helps,


    Michael Durkan

    • If the reply was helpful please upvote and/or accept as answer as this helps others in the community with similar questions. Thanks!
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