On 11/21/19 11:21 PM, Wesley Peng wrote: > Richard Damon wrote: >> The typical options for the mailing list are >> >> 1) Just not allow people from such domains to post to the list (the >> reject option you mention) >> >> 2) Rewrite the from address from people from such a domain to be from >> the domain of the list (often the list address). This is arguably >> discouraged by the email RFCs, as the from address should indicate the >> AUTHOR of the message, which is the original sender. It also can cause >> problems with identifying who sent the message, and can corrupt peoples >> address books if their program records that address as being associated >> with the sender. It can also make it harder to reply just to the sender. >> >> 3) Rewrite the message by wrapping it as an attachment, with the outer >> message being from the list. This has the problem that many clients >> won't handle the message in a useful manner. > > Thank you Richard. > > The email I am using is with domain of mail.ru, which has the > strictest DMARC policy setting. > > So mailing list like postfix-users doesn't deliver my message to > myself on this domain. And google groups rewrite the sender address to > their own address. > > I don't know why mail.ru has this setup, this seems unfriendly. > > Thanks. > That is a question to ask them. Basically the strict DMARC policy is designed for transactional email, where spoofing is a real danger. The side effect of it is that addresses on such a domain really shouldn't be used on mailing lists, or any other 3rd party senders not specifically set up for that by the domain owner. For the proper usages of this, it really isn't much of a problem, as the sorts of institutions that deal with this sort of transactional mail, probably shouldn't be using that same domain for less formal usages that tends to go with a mailing list.
The problems arise when a domain that doesn't really need that level of protection adopts it for some reason, especially if they don't inform their users of the implications of that decision. -- Richard Damon
