![]() ![]() The disclaimer will append the expected CR-LF combination to the message so that it can be delivered. If the sender cannot correct the sent messages, or if the gap must be bridged until the message format is corrected, the recipient can create an inbound transport rule to append a disclaimer to the messages from the problematic sender.For more information, see SMTP protocol extensions. Neither of these methods depends on the CR-LF combination to signal the end of the message. Enable Extended SMTP (ESMTP) on the receiving server so that the message can be sent by using CHUNKING or the BDAT command.This error frequently occurs with automated mailers (for example, reports or invoices) and bulk senders. Request that the sender correct the message format.To resolve this issue, do one of the following, as appropriate for your situation: This issue occurs if the source message transfer agent (MTA) didn't append the expected CR-LF combination to the end of the message as documented in Request For Comments (RFC) 2822. Users may not have experienced this problem in the past when they used Forefront Online Protection for Exchange (FOPE). SMTPSEND.BareLinefeedsAreIllegal message contains bare linefeeds, which cannot be sent via DATA ![]() If you perform a trace on the message, you find that message delivery failed and that a nondelivery report (NDR) that contains the following error message was generated: Users of Exchange Online or Exchange Online Protection may not receive an expected email message. ![]()
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