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Problem report
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Resolution: Fixed
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Trivial
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4.0.48, 5.0.37
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None
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Sprint 103 (Aug 2023), Sprint 104 (Sep 2023)
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0.125
We are still using Zabbix 5.0 including 4.0, and have encountered the same issue reported by ZBX-21830, related to the syntax of the "In-Reply-To:" email header field.
As a result, certain systems are unable to handle emails generated by Zabbix effectively, kindly ask you to consider backporting the ZBX-21830 fix to old versions Zabbix 4.0 and Zabbix 5.0.