It appears that comcast and yahoo have implemented DMARC mail filtering around the first of the month.
This breaks mailing lists such as 44net.
As a result, about a dozen people have had their mail from this list bouncing and they've been unsubscribed from the list as a result.
This message won't reach them, but if you happen to hear from a former participant in this list who is wondering what happened, you might let them know that their ISP has broken mail filtering software in place that is blocking their participation. - Brian
On Tue, 4 Aug 2015, Brian Kantor wrote:
It appears that comcast and yahoo have implemented DMARC mail filtering around the first of the month.
This breaks mailing lists such as 44net.
The Redhat/CentOS mailman RPM was recently updated to handle DMARC filtered domains.
Antonio Querubin e-mail: tony@lavanauts.org xmpp: antonioquerubin@gmail.com
On Tue, 4 Aug 2015, Antonio Querubin wrote:
It appears that comcast and yahoo have implemented DMARC mail filtering around the first of the month.
This breaks mailing lists such as 44net.
The Redhat/CentOS mailman RPM was recently updated to handle DMARC filtered domains.
Ugh, disregard. I just noticed it's running under FreeBSD.
The most recent ports version is 2.1.20 which does have DMARC support.
Antonio Querubin e-mail: tony@lavanauts.org xmpp: antonioquerubin@gmail.com
On Tue, Aug 04, 2015 at 07:01:17AM -1000, Antonio Querubin wrote:
Ugh, disregard. I just noticed it's running under FreeBSD.
The most recent ports version is 2.1.20 which does have DMARC support.
Thanks. We're currently running 2.1.14 which doesn't; I'll look into updating it. Unfortunately, the fix involves changing the way that message addresses are formatted which could cause some problems. - Brian
On Tue, 4 Aug 2015, Brian Kantor wrote:
Thanks. We're currently running 2.1.14 which doesn't; I'll look into updating it. Unfortunately, the fix involves changing the way that message addresses are formatted which could cause some problems.
That's correct. The munge-from option adjusts the from address to be the list-address and moves the sender address into the reply-to address only for the DMARC-specific recipient. If the recipient's domain doesn't specify a DMARC policy, the from-address is not touched.
This does add a small amount of DNS lookup overhead for each recipient.
Antonio Querubin e-mail: tony@lavanauts.org xmpp: antonioquerubin@gmail.com
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Antonio Querubin -
Brian Kantor