MailScanner 5.2.1-1 Released

Kevin Miller kevin.miller at
Tue Nov 5 19:17:55 UTC 2019

That's what I was concerned about.  It may be moot, as I'm doing DKIM/DMARC	checking in Postfix so hopefully messages will pass or fail DKIM (and hence, be accepted or rejected) prior to MailScanner touching them.  Definitely something to watch closely and test before applying it to my production servers...

Kevin Miller
Network/email Administrator, CBJ MIS Dept.
155 South Seward Street
Juneau, Alaska 99801
Phone: (907) 586-0242, Fax: (907) 586-4588 Registered Linux User No: 307357

-----Original Message-----
From: MailScanner < at> On Behalf Of Mark Sapiro
Sent: Tuesday, November 5, 2019 10:10 AM
To: mailscanner at
Subject: Re: MailScanner 5.2.1-1 Released



On 11/5/19 11:01 AM, Kevin Miller via MailScanner wrote:
> Groovy.
> One quick question:  Will the insertation of an "External message warning" affect DKIM/DMARC?

It will modify the message body which will break any DKIM signature which signs the body (hard to imagine one that doesn't) and thus will cause any DMARC check that relies on DKIM (as opposed to SPF) to fail.

Mark Sapiro <mark at>        The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan

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