Re: [mailop] safe-mail.net
It appears that Jeff Pang via mailop said: >As a old email provider, safe-mail.net has even no MX records, but using >A RR for incoming messages. do you know why they design this? for better >anti-abuse control? Most likely they stumbled around decades ago setting up the DNS, found that worked, and haven't changed it. The spec is quite clear that in the absence of an MX record, you pretend there is a MX 0 pointing at the A record. It has no effect I can think of on abuse management. R's, John ___ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
Re: [mailop] safe-mail.net
What is "A RR" ? On 7/11/2024 9:07 PM, Jeff Pang via mailop wrote: As a old email provider, safe-mail.net has even no MX records, but using A RR for incoming messages. do you know why they design this? for better anti-abuse control? Thanks. -- Cody Millard https://email.broker ___ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
Re: [mailop] safe-mail.net
On 2024-07-12 10:55, Cody Millard via mailop wrote: What is "A RR" ? A resource record. -- Jeff Pang jeffp...@aol.com ___ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
Re: [mailop] safe-mail.net
On 11Jul24, Cody Millard via mailop apparently wrote: > What is "A RR" ? Sounds like they're talking about DNS A RRs (Address records). Circa 1986 the DNS community introduced the MX RR with a view to transitioning away from how a mail client would look up an address RR directly for a target domain and connect to that. Nearly 1/2 a century later, it's still the case that most mail clients will look for address RRs in the absence of an MX. > > A RR for incoming messages. do you know why they design this? for better > > anti-abuse control? It could be just laziness. As for anti-abuse benefits, I recently re-activated a 1/4 century old dormant domain to see how much spam was still sent to it. It was quite a lot. But, I did note that when that domain only advertised A/ RRs the volume was slightly lower, by about 10-15%. So avoiding MX RRs might provide some marginal anti-spam benefit, but I guess it's also possible that more recent mail clients or mail client libraries may not fall back to address RRs in the absence of an MX and thus such a domain might miss genuine email. Mark. ___ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
Re: [mailop] safe-mail.net
On 2024-07-11 at 23:35:05 UTC-0400 (Fri, 12 Jul 2024 03:35:05 +) Mark Delany via mailop is rumored to have said: Nearly 1/2 a century later, it's still the case that most mail clients will look for address RRs in the absence of an MX. Because failing to do so would be ignoring a requirement of the SMTP specification. Any SMTP client which does not fall back to the A record when no MX records exists is fundamentally broken. -- Bill Cole b...@scconsult.com or billc...@apache.org (AKA @grumpybozo@toad.social and many *@billmail.scconsult.com addresses) Not Currently Available For Hire ___ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
Re: [mailop] safe-mail.net
On 12Jul24, Bill Cole via mailop apparently wrote: > > Nearly 1/2 a century later, it's still the case that most mail clients > > will look for address RRs in the absence of an MX. > > Because failing to do so would be ignoring a requirement of the SMTP > specification. Yes. Everyone knows this. The main observation, which appears to need spelling out, is that at the time it was hoped that this would be a "transition plan" for an Internet protocol which has proved to be a harbinger for many other "transition plans" that followed. Mark. ___ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
Re: [mailop] safe-mail.net
Bill Cole via mailop skrev den 2024-07-12 16:13: Any SMTP client which does not fall back to the A record when no MX records exists is fundamentally broken. and here its more fun when domain is nullMX it would be fail to failback to A/ :) sendmail -f yourmailaddrhere -bv f...@example.org back to see more football or tour de france :) ___ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
