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On Linode, were you using the default single IPv6 address, or did you request a prefix? I found that the default address was in a blacklisted /64, and couldn't
by flyinghamster 10y ago
On Linode, were you using the default single IPv6 address, or did you request a prefix? I found that the default address was in a blacklisted /64, and couldn't send email without it getting bounced or blackholed. Once I got my own /64, the problems went away (but DKIM+SPF was also mandatory).