Courier-imapをVer5にすると、Outlookとかでメール移動時にappendコマンドが実行され、以下警告が出るようになる。
[ALERT] Your IMAP client does not appear to correctly implement Unicode messages, see https://tools.ietf.org/html/rfc6855.html
原因は、以下に説明あり。
Courier Mail Server / Re: [Courier-imap] Outlook 2016 with Courier-IMAP 5.0.8 append alert
RFC 6855 - IMAP Support for UTF-8
Issue 34138: imaplib RFC 6855 issue - Python tracker
RFC6855に準じたアクセスをすれば、Courier-IMAPが警告を出さないだろうと考え、思考錯誤アクセスしたが、失敗する。。。
通常
* OK [CAPABILITY IMAP4rev1 UIDPLUS CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA IDLE ACL ACL2=UNION STARTTLS ENABLE UTF8=ACCEPT] Courier-IMAP ready. Copyright 1998-2018 Double Precision, Inc. See COPYING for distribution information. a LOGIN "hoge" "hoge" a OK LOGIN Ok. a APPEND INBOX {33} + OK From: "a" <a@hoge.go.jp> a a OK [APPENDUID 578246162 50] APPEND Ok.
失敗1
* OK [CAPABILITY IMAP4rev1 UIDPLUS CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA IDLE ACL ACL2=UNION STARTTLS ENABLE UTF8=ACCEPT] Courier-IMAP ready. Copyright 1998-2018 Double Precision, Inc. See COPYING for distribution information. a LOGIN "hoge" "hoge" a OK LOGIN Ok. a ENABLE UTF8=ACCEPT * ENABLED UTF8=ACCEPT a OK Options enabled a APPEND INBOX UTF8 ~{36} + OK From: "あ" <a@hoge.go.jp> Test a NO Error in IMAP command received by server.
失敗2
* OK [CAPABILITY IMAP4rev1 UIDPLUS CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA IDLE ACL ACL2=UNION STARTTLS ENABLE UTF8=ACCEPT] Courier-IMAP ready. Copyright 1998-2018 Double Precision, Inc. See COPYING for distribution information. a LOGIN "hoge" "hoge" a OK LOGIN Ok. a ENABLE UTF8=ACCEPT * ENABLED UTF8=ACCEPT a OK Options enabled a APPEND INBOX UTF8 {36} + OK From: "あ" <a@hoge.go.jp> Test * OK [ALERT] Your IMAP client does not appear to correctly implement Unicode messages, see https://tools.ietf.org/html/rfc6855.html a OK [APPENDUID 578246162 52] APPEND Ok.
失敗3
* OK [CAPABILITY IMAP4rev1 UIDPLUS CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA IDLE ACL ACL2=UNION STARTTLS ENABLE UTF8=ACCEPT] Courier-IMAP ready. Copyright 1998-2018 Double Precision, Inc. See COPYING for distribution information. a LOGIN "hoge" "hoge" a OK LOGIN Ok. a ENABLE UTF8=ACCEPT * ENABLED UTF8=ACCEPT a OK Options enabled a APPEND INBOX UTF8 (~{36} From: "あ" <a@hoge.go.jp> Test ) a NO Error in IMAP command received by server. From: NO Error in IMAP command received by server. * NO Error in IMAP command received by server. Test NO Error in IMAP command received by server. * NO Error in IMAP command received by server.
失敗4
* OK [CAPABILITY IMAP4rev1 UIDPLUS CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA IDLE ACL ACL2=UNION STARTTLS ENABLE UTF8=ACCEPT] Courier-IMAP ready. Copyright 1998-2018 Double Precision, Inc. See COPYING for distribution information. a LOGIN "hoge" "hoge" a OK LOGIN Ok. a ENABLE UTF8=ACCEPT * ENABLED UTF8=ACCEPT a OK Options enabled a APPEND INBOX UTF8 ~{36+} a NO Error in IMAP command received by server. From: "あ" <a@hoge.go.jp> Test From: NO Error in IMAP command received by server. * NO Error in IMAP command received by server. Test NO Error in IMAP command received by server. * NO Error in IMAP command received by server.
失敗5
* OK [CAPABILITY IMAP4rev1 UIDPLUS CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA IDLE ACL ACL2=UNION STARTTLS ENABLE UTF8=ACCEPT] Courier-IMAP ready. Copyright 1998-2018 Double Precision, Inc. See COPYING for distribution information. a LOGIN "hoge" "hoge" a OK LOGIN Ok. a ENABLE UTF8=ACCEPT * ENABLED UTF8=ACCEPT a OK Options enabled a APPEND INBOX UTF8 ~{36+} a NO Error in IMAP command received by server. From: "あ" <a@hoge.go.jp> Test From: NO Error in IMAP command received by server. * NO Error in IMAP command received by server. Test NO Error in IMAP command received by server. * NO Error in IMAP command received by server.