Some e-mail server is rejecting my e-mails:
host mail.xcellerate.nl [2a02:990:226:1:178:18:131:201]
SMTP error from remote mail server after RCPT TO:<email@example.com>:
550-[SPF] 2a01:7c8:fff8:3c:5054:ff:fea1:753e is not allowed to send mail from
2a01:7c8:fff8:3c:5054:ff:fea1:753e is not my ipv6 (my ipv6 passes SPF checks)
My box has an ipv6, which might be a problem? Is there something I can do on my end?