Emails with sender MISSING_MAILBOX at missing_domain

[Steffen Kaiser]

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On Wed, 14 Oct 2015, grupo correo wrote:

> we are working in the migration from courier-imap to dovecot
> 2.2.10-4.el7_0.1.x86_64.
>
> Some emails that send a internal application show as sender
> "MISSING_MAILBOX at missing_domain", i use like email client  Horde using
> dovecot like server. But if i open that email with Horde and courier-imap i
> can see the correct email sender.
>
> I think that the email of the sender is no correct or not accomplish some
> RFC. Can anyone help me to understand this?

Would you post the headers of the message?

- -- 
Steffen Kaiser
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