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List:       exim-users
Subject:    Re: [exim] Dkim error LONG_LINE
From:       Bill Cole via Exim-users <exim-users () exim ! org>
Date:       2021-04-28 14:29:29
Message-ID: D53E17C3-798D-4B9C-8D89-461D0A62D3A6 () billmail ! scconsult ! com
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On 28 Apr 2021, at 9:22, SysAdmin EM via Exim-users wrote:

> Could you tell me how to solve the problem? or what documentation to 
> read?

You need to fix whatever is generating the mail so that it stops sending 
mail with such long lines. The most reliable way to do that is simply to 
make it use Base64 or Quoted-Printable encoding rather than allowing it 
to attempt to send raw arbitrary binary data. If the sender is not under 
your control or you cannot configure it to use a particular encoding, 
you may be able to get Exim to sign al it to do so by excluding the 
sending host from the chunking_advertise_hosts list. To exclude all 
senders, just add 'chunking_advertise_hosts=""' to your exim.conf file. 
You may also want to consider 'smtputf8_advertise_hosts=""'. Both of 
those SMTP extensions have interoperability problems and if your MTA 
doesn't advertise support, most senders will perform the necessary 
encoding of messages into a traditional format.

-- 
Bill Cole
bill@scconsult.com or billcole@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Not Currently Available For Hire

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