Ironport have rolled out an update to their rule engine which has a bug causing mail problems. According to discussion on the mailop list, the new rule engine is folding the header with a line feed (LF) rather than a carriage return (CRLF). This is breaking things, including DKIM signatures. Ironport is aware of the issue. I expect an updated rollout shortly. AOL migrated the last few users onto...
March 19, 2019
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