What format should I follow for the UPN or username field for IMAP migrations?
The username name field, when migrating from IMAP systems, typically needs to include the administrator account as part of the username. Different IMAP systems follow different formats for the syntax.
The following is an explanation of the syntax used from the most common IMAP systems.
In your CSV file, each cell in the UserName column consists of two combined names: the user name of the person whose email is being migrated, and the user name of the mailbox admin account. The supported format for mailbox admin credentials is different depending on your Source email system. Here are the formats for several types of Source email systems.
If you're migrating email from the IMAP implementation for Exchange, use the format Domain/Admin_UserName/User_UserName for the UserName attribute in the migration file. Let's say you're migrating email from Exchange for Alberta Greene, Bobby Overby, Irwin Hume, Katrina Hernandez, and Mathew Slattery. You have a mailbox admin account, where the user name is mailadmin and the password is P@ssw0rd. Here's what your migration file would look like:
Source email systems, such as a Dovecot IMAP server that supports Simple Authentication and Security Layer (SASL), use the format User_UserName*Admin_UserName. Let's say you're migrating email from a Dovecot IMAP server using the mailbox admin credentials mailadmin and P@ssw0rd. Here's what your migration file would look like:
If you're migrating email from Mirapoint Message Server, use the format #user@domain#Admin_UserName#. Let's say you're migrating email using the mailbox admin credentials mailadmin and P@ssw0rd. Here's what your migration file would look like: