On 2022-09-12 21:59, bastian-muttu...@t6l.de wrote: > On 12Sep22 21:07+0200, Mihai Lazarescu wrote: > > Given the cheap VPS, I can mirror the setup on a second VPS from a different > > provider with quick DNS switch in case of issues. > > I just did that approx half a year ago. Before, everything was rolling > just fine (for more than 10 yrs). No dead ends of my outgoing mails. > After transferring the domain over to the new hoster, some destinations > did not receive my mails. Either filtered into spam, some got denied > (where I got a nice SMTP error reply) and some just got silently > dropped.
> This took me some time to figure out with each destination, why is that > happening. And sometimes also just guessing. At least the > mail-tester.com rate is 10/10, so it is not about my setup per se. Now that this thread has steered off-topic already, I dare to hijack it some more: My own setup had a score below 10/10, because my PTR record pointed to eden.one, while my mailserver's hostname was mail.eden.one. I changed the hostname (and the Dovecot/Postfix config) to eden.one, but subsequently found a couple of serverfault threads (related to the MxToolbox warning "Reverse DNS is not a valid Hostname") advising against this setup: https://serverfault.com/questions/711600/reverse-dns-is-not-a-valid-hostname-error-from-mxtoolbox/ https://serverfault.com/questions/599712/best-practices-for-fqdn-for-standalone-domain-is-a-two-part-domain-tld-okay/599725#599725 While I did run into a problem initially (overlapping mydestination and mailbox_virtual_domains in the Postfix configuration disrupted email delivery to Dovecot virtual mailboxes), the new setup now works quite well (and delivers a 10/10 score at mail-tester.com). Do you consider a PTR record pointing to a bare domain (eden.one) a serious issue? Or are there any downsides to pointing the PTR record to mail.eden.one? According to Cloudflare, reverse DNS lookups are mainly used for mailservers anyway – but are they relevant for other services (nginx etc) running on the same server at all? > The IP and/or subnet my VPS was in had a bad reputation at some > denylist services. Question was then, how to get removed from them. > Sometimes via automated forms and sometimes through personal > mail-conversation with other mail operators (t-online.de was very nice > and responsive to my surprise). I had exactly the same impression of the postmaster team at T-Online.de just two weeks ago: https://eden.one/2022/8/schwarzgelistet :) Thanks, Jan
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