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May
16
comment Reverse DNS does not contain the hostname error from MXToolBox
Yes, that's correct. The forward lookup for the A record has to match the reverse lookup for the PTR record.
May
16
answered Reverse DNS does not contain the hostname error from MXToolBox
Apr
27
awarded  Nice Answer
Apr
26
answered Why is it important that servers have the exact same time?
Apr
18
comment SSL certificate for CNAME
It doesn't matter if it's a CNAME or an A record -- the name just has to match what the browser is using to access the site. Whether you can add it to any server depends on the licence conditions of your certificate provider -- there's no technical problem with doing so.
Apr
18
answered SSL certificate for CNAME
Apr
2
answered How to speed up (very remote) overloaded server connection
Mar
29
answered Do I need “A record” for AWS ELB while I set up CNAME?
Mar
26
answered 1and1 domain redirected to Amazon ELB: 1and1 free email accs management
Mar
20
answered SOA: Is using PHP FPM to serve webservice traffic without NGINX a good idea?
Mar
14
answered Upgrade from t1.microto to 2.micro - AWS Free Usage Tier
Mar
9
awarded  Enlightened
Mar
9
awarded  Nice Answer
Mar
4
awarded  Enlightened
Mar
4
comment What does MX in SPF mean?
@Paul It doesn't violate RFC 7208, because it's a SHOULD NOT, not a MUST NOT.
Mar
4
awarded  Nice Answer
Mar
3
revised What does MX in SPF mean?
edited body
Mar
3
comment What does MX in SPF mean?
If everything is on the same IP address, you don't need all of the a, mx and ptr entries, because they will all resolve to the same IP address (assuming your reverse DNS for mydomain.com is set up correctly). Any one of the three will do. But the extra ones do no harm, and could be useful later if you acquire more IP addresses. Note also that the SPF record has nothing to do with what email is allowed to go to *.mydomain.com; that would be down to the configuration of your email server software.
Mar
3
answered What does MX in SPF mean?
Feb
28
answered SSH tunneling between two server