Prevent custom_header with non-ASCII characters (#1840)

sympa-community / sympa

Sympa, Mailing List Management Software

https://www.sympa.community/sympa

GNU General Public License v2.0

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Open ikedas opened 1 month ago

ikedas commented 1 month ago

The custom_header should not contain non-ASCII characters. Additionally, some minor bugs are fixed.

This may fix #1840.