Before we get started, we should point out that we have not tested this in practice. We are only basing this on public information (primarily from this article). Yet, it sounds reasonable, and feel free comment below and correct us.
Similar to both Dovecot and Microsoft Exchange, Mirapoint Message Server also support logging into users’ accounts via the admin account by using a modified username-string.
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One thing that many people are confused about is dual delivery (aka split delivery). Simply put, this means that emails will be delivered to two email systems simultaneously. This is often used to keep a new and a legacy system live in parallel. It is also frequently used during email migrations to ensure that no downtime occurs.
The concept of dual delivery isn’t very hard to wrap your head around, but how does it work? When reading forums, some people are confused about this. Some people think that it is sufficient to have two servers with the same priority level in the MX-record. This is not the case. Simply having two MX-records with the same priority will load balance between the two, but not deliver to both.
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We’ve already talked about migrating to and from both Dovecot and Google Apps for Business without having to reset the users’ passwords. In this post we’ll talk about doing the same for Microsoft Exchange.
Similar to Dovecot, Microsoft Exchange also supports IMAP login using a modified username-string. In Exchange, this string looks like this:
Domain/AdminUser/UserName
One of the most frequent questions we get through YippieMove relates to email routing. We touched briefly on this topic in the article Email 101 – An introduction to email under the hood. Yet, I feel the need to elaborate on this a bit more. In this article we’ll put IMAP and POP3 aside, as those are protocols for retrieving email, and has nothing to do with the routing of your email (which is a common misconception).
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Just like Dovecot, Google Apps also support logging in to users’ email account without resetting the passwords. Unfortunately, this feature is not available for Google Apps Standard-users (i.e. free), but is restricted to Google Apps for Business-users (and Education).
The way Google resolved this was to add support for OAuth authentication to their IMAP server. Hence, to use this feature, you will need an OAuth key.
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