refactor: fix iterable types in Email
#16194
| Job | Run time |
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| 2m 46s | |
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| 1m 38s | |
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| 4m 40s | |
| 1m 17s | |
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| 7m 21s | |
| 2m 21s | |
| 56s | |
| 1m 4s | |
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| 1m 45s | |
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| 2m 12s | |
| 3m 32s | |
| 4m 49s | |
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| 3m 42s | |
| 46s | |
| 1h 52m 17s |