Georg Gell wrote:
Hmm, at the moment, this TXT-record is enough for all my domains afaik:
v=spf1 a mx -all
This means they can send via webmail from the server and via all mx servers as mail gateways.
Yes, anything sent from one-stop-solutions.at will have an SPF record. However, mail.one-stop-solutions.at would not. Nor would any other *existing* subdomain. Took me a little to wrap my head around this, but apparently because of how DNS works, you can't just create a wildcard entry to cover everything. The wildcard would cover everything not explicitly defined.
True, but that does not concern me. I am a small ISP, and my clients just need "normal" mail addresses. I don't sell sub domains, so nobody is going to send an email from a sub domain. And usually people feel the shorter an email address is the better.
And having
v=spf1 a mx -all
makes imo sense in any case as a reasonable default for any domain. If it is not what one needs in certain special cases it can always be changed later ;)
