esackbauer
If I follow the logs, it seems to still be a PTR records problem through my ipv6 (?):
A59013065E0: to=<celian@gmail.com>, relay=gmail-smtp-in.l.google.com[2a00:1450:400c:c09::1b]:25, delay=5.2, delays=0.12/0.24/4.5/0.38, dsn=5.7.1, status=bounced (host gmail-smtp-in.l.google.com[2a00:1450:400c:c09::1b] said: 550-5.7.1 [2a02:c206:2243:4010::1] Gmail has detected that this message does not 550-5.7.1 meet IPv6 sending guidelines regarding PTR records and authentication 550-5.7.1 . For more information, go to 550 5.7.1 https://support.google.com/mail/?p=IPv6AuthError 5b1f17b1804b1-4390af0c6b5si299245e9.154 - gsmtp (in reply to end of DATA command))
I think that there is also an infinite loop:
Feb 4 14:13:20 84f7f1f467b7 postfix/smtp[806]: 0E4873065DE: to=<celian@vullwen.com>, relay=mail.vullwen.com[86.48.5.84]:25, delay=2.8, delays=2.2/0.44/0.12/0, dsn=5.4.6, status=bounced (mail for vullwen.com loops back to myself)