Reply to List has stopped working

support
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Reply to List is supported by many if not all mail programs. Suddenly after some upgrade or other the requisite header field is blank or missing. What has happened and how to fix?

What mail header is involved, actually?

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  • are you hosting your own mail server ?
  • do you have force_https setting enabled ?
  • when last did you update via the command line/rebuild the app?
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Not self hosting mail, using the docker mail-receiver addon, and Amazon SES for outbound mail. Re force_https - I have not changed anything. I will try a rebuild.