> On 6. Aug 2017, at 18:40, Walter Alejandro Iglesias <w...@roquesor.com> wrote:
>> On Sun, Aug 06, 2017 at 06:02:25PM +0200, Jesper Wallin wrote:
>> Like Martijn pointed out, you're sending mail from a IP which is not
>> intended for mail-servers.
> This was my main question.  What is an "IP intended for mail-servers"?

The question should be "what are IPs **not** intended for mail-servers?"

The ranges of ISPs for home-users and the dsl-, cable-, whatever-connection are 
well-known and pretty much on all of the blacklists since the only thing you 
can usually expect from them is spam from botnets. Legitimate mails are rather 
rare from those ranges, thus they get blocked. 
To not get blocked by google and hotmail you need an IP from some 
hosting-provider, university or something like this; a PTR-record for your 
server and at least an SPF-, even better a DKIM-record. And if you ever send 
out mail, you maybe want a secondary IP for temporary failover-cases if you 
land  temporarily on a black list. 


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