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3

E-Mail security sucks. So in the end, you're probably going to be faced with a decision where all your options are terrible, and break different things for different reasons. As for SPF specifically, a mailing list will cause a failure if it forwards a message, without rewriting the headers. A list can configure itself to work however it pleases, so there ...


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Your understanding of how SMTP works will help you understand what's going on here. The website is submitting the forms to an SMTP server. That SMTP server is returning the error messages you're seeing. Don't think about MX records and DNS-- you're concerned with the SMTP server that the form processing script is using. MX records and DNS are irrelevant at ...


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I am using Ubuntu Server 12.04 and I tried the above solutions. However, I found that simplest and easiest way was in 10-auth.conf to set auth_username_format = %n I use PAM for the authentication which is the default in Ubuntu 12.04.


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I think that contactgroups must be contact_groups


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The auth_http does two main things: It authenticates users (including various options to effectively delay users on failed authentication). And it determines which backend to use (and which username and password to use in backend authentication, if at all). While in some cases authentication can be handled directly by a backend, it's not something always ...


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Your first example sends both stderr and stdout to the file (2>&1) ; the MAILTO variable set in the cron will capture any output that is not redirected, and this combined with directing the output to the file means that no output is available for the cron to email. I'd suggest using tee to append the output to the file as well as sending it to stdout; ...


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I've not looked at the DKIM part. Concerning the SPF record I see the following used in most example: v=spf1 mx -all This is documented here: http://www.openspf.org/SPF_Record_Syntax However "+mx" should also be correct according to RFC 7208 (Thanks Chris for pointing this out). Maybe it is stil worth a try... I really don't know what to suggest ...


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If your mail servers are down, senders will keep trying for 3 to 5 days before returning the mail to sender. This includes most mailing lists. While this value is customizable, I've never seen any mail server return mail for a temporary failure like that in less than 24 hours. Sendmail and Postfix both default to 5 days, exim (which is often used by cheap ...


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Turns out there doesn't seem to be anything wrong with my configuration. What's happening is that my messages are being processed by mailman correctly, and being relayed out to the list. There are a couple of receivers however which (for whatever reason is unique to them) reject the message. Because I have actually correctly configured SPF, I'm seeing the ...


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You can use a procmail and a postfix.



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