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Discourage automatic replies to Synapse's emails (#13957)
Co-authored-by: Patrick Cloke <clokep@users.noreply.github.com>
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changelog.d/13957.feature
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changelog.d/13957.feature
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Ask mail servers receiving emails from Synapse to not send automatic reply (e.g. out-of-office responses).
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@ -187,6 +187,19 @@ class SendEmailHandler:
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multipart_msg["To"] = email_address
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multipart_msg["Date"] = email.utils.formatdate()
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multipart_msg["Message-ID"] = email.utils.make_msgid()
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# Discourage automatic responses to Synapse's emails.
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# Per RFC 3834, automatic responses should not be sent if the "Auto-Submitted"
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# header is present with any value other than "no". See
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# https://www.rfc-editor.org/rfc/rfc3834.html#section-5.1
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multipart_msg["Auto-Submitted"] = "auto-generated"
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# Also include a Microsoft-Exchange specific header:
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# https://learn.microsoft.com/en-us/openspecs/exchange_server_protocols/ms-oxcmail/ced68690-498a-4567-9d14-5c01f974d8b1
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# which suggests it can take the value "All" to "suppress all auto-replies",
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# or a comma separated list of auto-reply classes to suppress.
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# The following stack overflow question has a little more context:
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# https://stackoverflow.com/a/25324691/5252017
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# https://stackoverflow.com/a/61646381/5252017
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multipart_msg["X-Auto-Response-Suppress"] = "All"
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multipart_msg.attach(text_part)
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multipart_msg.attach(html_part)
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