On Monday, 12 February 2018 10:17:43 AM AEDT AC via Exim-users wrote: > I'm receiving a fair amount of spam that is coming through Microsoft's > Office 365 service (spammers signing up for the one month free trial of > Office 365). This provides them a DKIM siguature that is valid and has > a customized subdomain of onmicrosoft.com. The email itself has a > sender domain that may be entirely different and will likely change. > > What I'd like to do is set up an ACL that checks the DKIM signature and > rejects it if the domain is anything ending with onmicrosoft.com. > > I tried using a deny rule in my DKIM ACL that looked at the dkim_signers > but I got the implementation wrong because it rejected anything that had > a DKIM validation in it no matter the domain. > > deny message = DKIM from unwanted domain > dkim_signers = *.onmicrosoft.com > > How would I accomplish what I want if it's even possible? http://exim.org/exim-html-current/doc/html/spec_html/ch-support_for_dkim_domainkeys_identified_mail.html has the $dkim_cur_signer and $dkim_domain as expansion items inside acl_smtp_dkim. You could put one of those in a condition, (deny condition = ...) to reject the mail.
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