I’ve tested my MTU settings and they’re working perfectly fine, so it wouldn’t 
be on my end for an MTU thing.

I also did another lookup of the "offending" IPs and they’re all coming from 
CloudFlare, which is a bit baffling to me as I’m not using CloudFlare. Which 
begs the question, why is CloudFlare attempting to connect to my email server.


> On May 17, 2018, at 2:24 AM, Yves via Fail2ban-users 
> <fail2ban-users@lists.sourceforge.net> wrote:
>> I'd also check your IPv6 connectivity (including ICMPv6) to the client, 
>> these timeouts are more likely caused by MTU problems than malicious intent.
> I wouldn't know, but if you're right, this is indeed the _first_ thing to 
> check! :-)

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