I guess i have frickeled a working mailserver setup now.

Next up: Stop everything on the old server, transfer 9GB of mail to the new server, then switch over MX records.

Then, watch everything explode.

rspamd seems to work, mails are getting tagged as spam/greylisted, viruses are being rejected

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But ... do i want to block hosts with no valid PTR record from sending me mails?

I'd assume only spammers use hosts without PTR!?

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@franzi Do you (and others reading this) know about `dsync`?
It's integrated into Dovecot and does near-realtime incremental master-master synchronisation of email and Sieve filters between two Dovecot instances. Also useful for one-off copying for migrations like this.

@voidptr TIL, thanks.

Though I just rsync-ed the maildir over, which worked fine.

@franzi - yeah, made the switch from Spamassassin to rspamd lately as well. Didn't regret it so far.

Only downside:
- no munin plugin yet for rspamd (at least I haven't found one)
- Roundcube has no rspamd plugin as it has for SA, so that users could config their own settings.

@franzi at least they did a year ago.

When I was running my own mail server, I bounced everything without a valid PTR, no problems except Microsoft

@franzi Microsoft, I guess. They just don't care

@morre @franzi also ich hab seit Jahren ein reject_unknown_client_hostname drin und keinerlei Probleme.

@leah @franzi spannend. Ich auch nicht, ich hab keinen Microsoft-Account.

@franzi United Internet also has hosts without valid ptr. It's a pain in the ass to debug it, since some of their servers have one.

@franzi In IPv4 environments, reject_unknown_client_hostname usually works fine.

I'm thinking about enabling IPv6 mail reception on my mailserver, but there I believe I need to disable it, because PTR records in IPv6 are somewhat scarce. And I'm not yet sure if I should disable it globally or try some hack to disable it only for IPv6.

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