Hi,

> Probably that domain was involved in mass mailing in the past (mostly 
> unsolicited). I don’t see other reason for which they needed mailgun in spf.
> Send an email to gmail, from another source which works perfectly and include 
> the www.domain.com <http://www.domain.com/> in the body. If still goes to 
> spam, the domain is blacklisted in gmail.

The SPF record was mine, I used Maildrop to send some test mails. I highly 
doubt isogram.nl <http://isogram.nl/> is on any blacklist, I tried what you 
suggested, the mail didn’t get flagged as spam. Also, the domain appears on no 
blacklist as far as I can tell.

> Personally I think that the most likely explanation is that Google does
> not have enough history of the IP address. The more (genuine) mail you
> send from an IP address, and the longer you do it for, the less likely
> the email will be classed as spam.

Yeah, there appears to be no other option, since the config seems OK.

> You might like to check your IP addresses at the site below. It's not
> Google, but it will give you a general idea as to how your IP addresses
> are seen by receiving mail servers:
> 
> https://senderscore.org/lookup.php <https://senderscore.org/lookup.php>

I did that, it didn’t report much of anything. I guess they don’t have any data 
on the IP.

--
- Tiemo

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