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https://issues.apache.org/jira/browse/JAMES-4086?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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hung resolved JAMES-4086.
-------------------------
Resolution: Fixed
> Mailet for folding long lines
> -----------------------------
>
> Key: JAMES-4086
> URL: https://issues.apache.org/jira/browse/JAMES-4086
> Project: James Server
> Issue Type: Improvement
> Reporter: hung
> Priority: Major
> Time Spent: 4h 40m
> Remaining Estimate: 0h
>
> *Why?*
> Some email clients (Outlook!) can generate some arbitrary long lines. For
> instance a loooong discussions with many References can have a References
> line exceeding 1000 characters.
> {color:red}References:
> <caou6bwkrkzbpuxbnz88uofkxyybv9y8cdpwyhxtpd9r-_ue...@mail.gmail.com>
> <pr0p264mb335651d4b1a9a2a24afab535d2...@pr0p264mb3356.frap264.prod.outlook.com>
>
> <pr0p264mb33563d04b559ec154855e36ad2...@pr0p264mb3356.frap264.prod.outlook.com>
>
> <mwhpr0801mb36911622d86ea054d329d81fe7...@mwhpr0801mb3691.namprd08.prod.outlook.com>
>
> <sn4pr0801mb3696195e7746201412671f71e7...@sn4pr0801mb3696.namprd08.prod.outlook.com>
>
> <pr0p264mb3356634284cab379147bc77ad2...@pr0p264mb3356.frap264.prod.outlook.com>
>
> <sn4pr0801mb369668222a6726e917eb5761e7...@sn4pr0801mb3696.namprd08.prod.outlook.com>
>
> <pr0p264mb3356362a5fc890d0e53567f5d2...@pr0p264mb3356.frap264.prod.outlook.com>
>
> <pr0p264mb33563b96b1cc3774f1bf23fbd2...@pr0p264mb3356.frap264.prod.outlook.com>
>
> <sn4pr0801mb36961e26d369149c13c84e2ae7...@sn4pr0801mb3696.namprd08.prod.outlook.com>
>
> <cyxpr08mb90174a13cf388a1e7eb48d0df9...@cyxpr08mb9017.namprd08.prod.outlook.com>
>
> <pa4pr07mb7101c5f735acd27149593a1c89...@pa4pr07mb7101.eurprd07.prod.outlook.com>
> <CYXPR08MB90173
> 4D5BD04714BD6A
> 04551f9...@cyxpr08mb9017.namprd08.prod.outlook.com>
> <pa4pr07mb710195e419888bbe1988427989...@pa4pr07mb7101.eurprd07.prod.outlook.com>
> <042d01db09ec$beedd0f0$3cc972d0$@avocat.fr>{color}
> The issue is that RFC5322 mandates not exceeding 998 characters per lines so
> postfix is configured by default to fold such long lines!
> We do protect the references header as per our DKIM signing:
> {color:red}DKIM-Signature: a=rsa-sha256;
> b=wRnnh7MWRU2Rly2nVeoKaao+UOlG87Cs0MRD614YE3TokZsaGVqMZQVYgqWQ+9XzBqzF0tp7Zt+907TEBSTIHAcShikJuiv0Sl5fjrgzpaJrkPtYe51MmPfkSY6USXmdOsdXhZBhVdBJ5M+r4LaZL0LYYKJZVn1re4khGsalvXo=;
> s=s2; d=avocat.fr; v=1; bh=2AjlhSVg7EzuioM7CZqg3hz0OtP3/dOlGrqo3PYe9eg=;
> h=from : reply-to : subject : date : to : cc : resent-date : resent-from :
> resent-sender : resent-to : resent-cc : in-reply-to : references : list-id :
> list-help : list-unsubscribe : list-subscribe : list-post : list-owner :
> list-archive;{color}
> And doing such folding after the signature indeed breaks the DKIM signature.
> Some domains do not interprete well our p=quarantine policy and just reject
> the mails:
> {color:red}Diagnostic-Code: smtp; 550 5.7.0 Email quarantined per DMARC
> policy{color}
> Thus we would need to fold headers correctly prior to forwarding the mails to
> Postfix.
> *How?*
> Write a FoldLongLines mailet defaulting to 998 chars (like postfix)
> It would fold headers that exceed this length.
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