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@jwildeboer@social.wildeboer.netPeople sending me e-mails, me replying to them only to find out that their mailserver is blocking my mailserver for weird reasons, forcing me to reconfigure my mailserver so I can get through with their mailserver which immediately blocks me *again* for "abusive behaviour". Well, sorry, fan of my blog. You'll never get my reply I guess. Also dear mailbox.org: your laziness wrt throwing blacklists in your server config is excluding small servers. You are NOT helping with decentralising e-mail.
To sum up. My mailserver, which has been running since 14 years, continuously updated and maintained, well respected by hotmail, google, outlook, yahoo and many more, yes, even t-online!, is blocked by mailbox.org because they don't like my IPv6 address based on a Spamhaus blacklist that tries to educate providers to follow their rules wrt IPv6. Le sigh.
And before you ask: yes, my mailserver supports DKIM, DMARC, SPF, accepts only modern ciphers for TLS communications, has a working PTR record in DNS. Spamhaus just hates the fact that I have my mailserver running to OVH, who don't give me a /64 for my IPv6 which they deem to be reason to block me in their CSS blocklist, which mailbox.org uses on all their servers.
Spamhaus just shrugs and tells me to STFU and find a better provider as they won't change their policy. "NOTE: If your allocation is smaller than /64, we cannot remove it from CSS, and the situation needs to be corrected with the provider prior to requesting removal." https://check.spamhaus.org/listed/?searchterm=2001:41d0:305:2100::548c
Mailbox.org just shrugs and tells me to read what Spamhaus is telling me.
But if I use IPv4, mailbox.org happily accepts my mails. From the very same server. So I guess they just don't want IPv6 traffic?