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docs: Document ADD_TOKENS_TO_NOREPLY_ADDRESS in email.md.
Rewritten and moved by tabbott.
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@@ -115,7 +115,22 @@ If it doesn't work, check these common failure causes:
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your hosting provider's firewall.
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* Your SMTP server's permissions might not allow the email account
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you're using to send email from the `noreply` email address.
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you're using to send email from the `noreply` email addresses used
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by Zulip when sending confirmation emails.
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For security reasons, Zulip sends confirmation emails (used for
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account creation, etc.) with randomly generated from addresses
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starting with `noreply-`.
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If necessary, you can set `ADD_TOKENS_TO_NOREPLY_ADDRESS` to `False`
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in `/etc/zulip/settings.py` (which will cause these confirmation
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emails to be sent from a consistent `noreply@` address). Disabling
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`ADD_TOKENS_TO_NOREPLY_ADDRESS` is generally safe if you are not
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using Zulip's feature that allows anyone to create an account in
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your Zulip organization if they have access to an email address in a
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certain domain. See [this article][helpdesk-attack] for details on
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the security issue with helpdesk software that
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`ADD_TOKENS_TO_NOREPLY_ADDRESS` helps protect against.
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* Make sure you set the password in `/etc/zulip/zulip-secrets.conf`.
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@@ -158,3 +173,5 @@ aren't receiving emails from Zulip:
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if Django documentation references setting `EMAIL_HOST_PASSWORD`,
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you should instead set `email_password` in
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`/etc/zulip/zulip-secrets.conf`.
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[helpdesk-attack]: https://medium.com/intigriti/how-i-hacked-hundreds-of-companies-through-their-helpdesk-b7680ddc2d4c
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