On 2021-04-01 11:02, Michael Grimm wrote:
Background of my question:
One of the bigger email providers in Germany (t-online.de = TOL)
started to block my IPv4 address. I do assume that this has to do with
being blocklisted (see
http://www.uceprotect.net/en/rblcheck.php?ipr=135.125.211.209),
although my IP address isn't blacklisted but the subnet it is member
of.
You do wrongly assume this. T-online.de is not using UCEProtect
for blocking mail. Hardly anyone in the world is doing so, save
some over-eager hobbyists who learn how to use a DNSBL and think
they need to add as many DNSBLs as possible.
I checked for my IPv6 address, and it isn't blacklisted. Thus I tried
to bypass TOL's blocking by using IPv6 until I will have been
whitelisted by them (what happened in the meantime). FTR: It wouldn't
have worked because TOL's mailservers are IPv4 only.
But it is good to know that smtp_address_preference might help me with
other ISP blocking my IPv4.
You're much more likely to encounter delivery problems on v6 than
on v4.
--
http://rob0.nodns4.us/
