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People 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.
@jwildeboer@social.wildeboer.netSpamhaus 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?