Make the `temp/mail_debug` dir group writeable if `temp` one is

• Make the temp/mail_debug dir group writeable if temp one is

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• [FIX] mail: Make the temp/mail_debug dir group writeable if temp one is

See merge request !4950 (merged)

(cherry picked from commit 350c7d82)

ea42576b [FIX] mail: Make the temp/mail_debug dir group writeable if temp one is

Co-authored-by: Jonny Bradley jmail@nospaces.net