Fix sending: never send null for an empty header property
Rebuilt from: git history. Opening date is approximate.
*The original description was not recovered.*
**Merged** 2026-08-23 as coffey-labs/ihasmail@24fac8204ab7
<details><summary>Commit message</summary>
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Fix sending: never send null for an empty header property
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</details>
<sub>Rebuilt from: git history. Opening date is approximate.</sub>
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The original description was not recovered.
Merged 2026-08-23 as coffey-labs/ihasmail@24fac8204a
Commit message
Rebuilt from: git history. Opening date is approximate.