![]() ![]() I suppose the most basic is simply not putting all your eggs in one basket.įar too many systems use an email address as their unique identifier, so when one system gets hacked, and the passwords are leaked, bad guys are halfway to getting into your other accounts, a process known as "password stuffing." Having multiple email addresses is a great defense from this. Referencing otherdomain.There are many reasons to have multiple email addresses. In my previous solution, only the SPF test passed because the From: field was still Have you got a better idea, or a clear explanation? Leave it in the comments! forward mechanism would have done a good job but I was wrong. To the current user and origin domain but should this affect the delivery mechanism? Postfix on behalf of the user, a whole new mail sending process, the Return-Path: is set What’s the magic behind the use of procmail? I’m not sure. I removed the unnecessary headers, but here we are, the mail went through, and for a reason I Received: from ( ) by (Postfix) with ESMTPS id 85BD24E5C9 for Tue, 17:49:00 +0100 (CET) Spf=pass (: domain of designates 2001:bc8:234c:1::1 as permitted sender) (p=QUARANTINE sp=QUARANTINE dis=NONE) om= This is easily done by the header_checks postfix feature, basically this:ĭelivered-To: by 2002:a05:6a10:cd05:0:0:0:0 with SMTP id gw5csp3514080pxb ĪRC-Authentication-Results: i=1 mx. Rewrite DKIM in the header did not leave me a good / clean feeling, so let’s simply try and ![]() ![]() Have a DKIM entry, and obviously they don’t match. Oh, I see… the DKIM key doesn’t match because the mail is originally from which has a DKIM entry, but is delivered by my own mail server, which also ![]() Protect our users from spam, the 550-5.7.26 message has been blocked.ĥ.7.26 information. Information or fails to 550-5.7.26 pass authentication checks. Virtual_alias_maps = hash:/etc/postfix/virtualĮasy! let’s send an email from another domain just to validate everything works correctly: Diagnostic-Code: smtp 550-5.7.26 This message does not have authentication ![]()
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