> Date: Tuesday, December 08, 2020 16:04:43 +0100 > From: Rene Veerman <rene.veerman.netherlands@xxxxxxxxx> > >> On Tue, Dec 8, 2020 at 2:15 PM Richard wrote: >> >> > Date: Tuesday, December 08, 2020 11:35:30 +0100 >> > From: Rene Veerman <rene.veerman.netherlands@xxxxxxxxx> >> > >> > i've been at this for a few days now, but keep on getting stuck.. >> > >> > while it may be due to my debugging efforts, i can't even get >> > Thunderbird to send email through that postfix server of mine at >> > the moment, it delivers the following bounce messages, with a >> > link that's completely unhelpful :( >> > >> > This is the mail system at host smtp.nicer.app. >> > >> > I'm sorry to have to inform you that your message could not >> > be delivered to one or more recipients. It's attached below. >> > >> > . . . >> > >> > The mail system >> > <rene.veerman.netherlands@xxxxxxxxx> >> > <rene.veerman.netherlands@xxxxxxxxx>: host >> > gmail-smtp-in.l.google.com[2a00:1450:4013:c03::1b] said: >> > 550-5.7.1 [2001:980:ed77:1:d565:64ae:934a:c18d] Our system >> > has detected that 550-5.7.1 this message does not meet >> > IPv6 sending guidelines regarding PTR 550-5.7.1 records >> > and authentication. Please review 550-5.7.1 >> > https://support.google.com/mail/?p=IPv6AuthError for more >> > information 550 5.7.1 . bt17si3147299edb.469 - gsmtp >> > (in reply to end of DATA command) >> > >> >> Your message is being rejected by google because you don't have a >> matching PTR record: >> >> message does not meet IPv6 sending guidelines regarding >> PTR 550-5.7.1 records >> >> See the: >> >> Follow recommended IP practices >> Verify the sending server PTR record >> >> section of the document they reference for specific details, but >> you should follow the guidelines on SPF/DKIM/DMARC in the following >> section too: >> >> Make sure your messages are authenticated >> >> In general, and especially when sending to google via IPv6, your >> mail configuration (server and dns records) needs to be fully >> standards compliant. >> > > ok, and how would i set all of this up, at afraid.org, a free dns > provider? The PTR (aka rDNS, in-addr.arpa) record is managed by the organization that controls the IPnumber(s) used by the mail server. [please do not include my direct address in replies.]
