Error: Let's Encrypt acc registration failed - issue in multi server & multi domain

[sahsanu]

@makader

Thanks for your reply.

You’re welcome.

@makader

Updating name server using the command

If you’re using a public resolver like 8.8.8.8 and also using zen.spamhaus.org as a DNSBL for Exim (which is the default), check out this post.:

Exim rejecting emails

Because Spamhaus rejects requests for some public dns resolvers. You can: 1.- Disable the spamhaus dnsbl (not recommended) 2.- Change the dns resolver used by your server to one not blocked by Spamhaus like 76.76.2.0 and 76.76.10.0 (Control D Free DNS) 3.- Use your own DNS recursive resolver like bind9, PowerDNS, unbound, etc. 4.- Create a free Spamhaus data query account and you could use your current dns resolvers.