Emails With Encoding UTF-7 Can't Be Processed By JMailClient and error "JMailClient object failed to retrieve message stream object from email server" is displayed (Doc ID 2969811.1)

Last updated on NOVEMBER 09, 2023

Applies to:

Symptoms

Emails with encoding UTF-7 cannot be processed by JMailClient

After migrating mailboxes from on-premise Exchange to Exchange Online (except one mailbox) when an email with encoding UTF-7 arrives the JMailClient cannot retrieve the email. The UTF-7 encoded email is already marked as read in the mailbox and JMailClient stops processing another mails in this mailbox. In the on-premise Exchange mailbox the emails with UTF-7 encoding can be processed successfully without any errors.

The issue didn’t happen in the IP16 version.

The following errors occurs in the IMAPSMTP and in CIR logs:

IMAPSMTP_***.log

DBG: Return: ERROR
ERROR:Error retrieving mail stream object, could not copy stream object
ERROR:JMailClient object failed to retrieve message stream object from email server
ERROR:Could not retrieve email message
ERROR:JMailClient object failed to retrieve message stream object from email server
ERROR:Could not retrieve email message

CommInboundRcvr_***.log

JMailClient object failed to retrieve message stream object from email server
Could not retrieve email message

The issue can be reproduced at will with the following steps:

1. Migrate mailboxes from on-premise Exchange to Exchange Online
2. A new mail with UTF-7 encoding is received
3. JMailClient stops processing other mails for this mailbox as it’s stuck in this UTF-7 one and is already marked as read in the mailbox

Changes

Migrate mailboxes from on-premises Exchange to the Exchange Online.

Cause

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