Post moved here from another thread concerning PMs delivered by email ending up in spam boxes
Have you set up an SPF record in the DNS to legitimize your server’s IP to send e-mails for this domain? (I guess it’s a question to David… too lazy to look up the TXT records myself since I’m writing on a phone).
Yes, all done and checked multiple times.
I see no evidence that SPF does much these days, because most spam comes from rented botnets and those are real PCs emitting emails via their ISPs so their SPF will be “good”.
Hmm, I just checked the SPF record, and it says:
“v=spf1 mx a ip4:82.69.126.32/32 ip4:81.187.14.238/32 include:ukservers.net”
Then I checked an e-mail that I received (“mentioned in a post”), and it was sent from some private class C IP (192.168.1.100), and then it goes through only one server before being delivered into my e-mail provider (which does NOT recognize it as SPAM btw). The outgoing server is this:
Received: from stratford-1000.dsc.net ([87.246.123.5])
But this IP address isn’t covered by the above SPF record!
In other e-mails, I can see:
Received: from edgware-1002.dsc.net ([87.246.123.4])
So you may want to add this CIDR range to your SPF record: 87.246.123.0/24
It will give you all IPs between 87.246.123.0 and 87.246.123.255
I suggest this DNS TXT record (preserving the two allowed IPs and one domain which were already present and of whom I don’t know what you need them for):
euroga.org. IN TXT “v=spf1 mx a ptr ip4:87.246.123.0/24 ip4:82.69.126.32/32 ip4:81.187.14.238/32 include:ukservers.net ~all”
The “a” means: “All the A records for domain are tested. If the client IP is found among them, this mechanism matches.”
The “mx” means: “All the A records for all the MX records for domain are tested in order of MX priority. If the client IP is found among them, this mechanism matches.”
The “~all” at the end means: “SoftFail: Not compliant will be marked but accepted”. You may want to change it to “?all”, which would mean “Neutral: Mails will probably be accepted”.
It happens to be me who has the control panel for euroga.org and I have done the above. Please let me know if it looks OK.
However I recall being around this SPF stuff many times and one of the things that comes up is that e.g. some SMTP servers don’t support the /24 etc notation. Or the ip4: bit.
Let’s see if this works.
We are getting bounces again from .fr domains. Discussed here.
This was a problem a few years ago, with free.fr etc bouncing all emails in English and now it seems to be reoccurring sporadically.
Obviously I can’t PM anyone who is getting this 
but basically your PMs aren’t going to be working.
