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We have a client using Lotus Notes which I understand is powered by Domino servers behind the scenes.
We require connection to a shared mailbox on this server via IMAP.

We have done it previously on Exchange with a workaround you supplied separating the username and mailbox name with a null character.

We are trying this approach with Domino, but it still appears to see only the folders of the user's account rather than the folders in the shared mailbox.

Applies to: Rebex Secure Mail

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The null-character workaround only works with ImapAuthentication.Plain and it actually makes the Imap object use the standard method to authenticate/authorize to access a shared mailbox (as defined by RFC 4616).

If the following doesn't work, then it most likely means that Lotus Notes / Domino does not support this standard method or that it expects a different form of the mailbox string.

imap.Login(mailbox + "\0" + userName, password, ImapAuthentication.Plain);

Are you able to connect to a shared mailbox using any third-party IMAP client?