Spamhaus SBL is blocking my smtp IPv6 address and attempts at removing the block are futile. Is it true that were I to obtain a dedicated IP address for MIAB that Spamhaus is lilely to stop blocking SMTP?
Also I read somewhere that use of IPv6 with MIAB is discouraged. Wouldn’t disabling IPv6 on my mail server cause problems talking to other servers and services inside and possibly also outside the data center, i.e. monitoring?
Thank you in advance!
What do you mean by dedictaed IP address? But yes, you do need a fixed IP address.
Are you hosting your server on premise, maybe even on a DS-Lite residential connection? Residential IP ranges are listed at Spamhaus “by default”, regardless of whether they are ipv4 or ipv6 addresses.
If you want to host an email server on premise, you need at least a business subscription, with at least one fixed IPv4 address that does not reside in a residential range. And If you want to use IPv4 and IPv6, you need proper Dual Stack. However with most ISPs these subscriptions are expensive. The cheap business subscriptions are often the same as home user subscriptions, with maybe a faster hotline, and even if you can get a fixed IP addresses with such a subscription, these addresses could be in the same range as the dynamic home user IPs and therfore it’s very likely, that they are also listed at Spamhhaus, at least in a PBL list.
No, because nobody who operates a productive mail server would run it on IPv6 only.
EDIT:
Ooops… Why does a three year old post suddenly appear here. Anyway, maybe the answer will help someone else, I assume OP has solved his issue in the meantime 
Someone wrote a spam reply which was removed … but the thread still appears in the index as though the reply was still there.