SPF, SMTP, DNS issues

I am using the MDaemon Email Server.
When I test my domain (mail.mydomain.com.sg) with MX Toolbox, it shows the following error:

      spf       mydomain.com.sg      No records found       
      smtp      mail.mydomain.com.sg      Reverse DNS does not match SMTP Banner       
      smtp       mail.mydomain.com.sg      5.782 seconds - Warning on Transaction Time       
      dns      mydomain.com.sg      At least one name server failed to respond in a timely manner       
      dns      mydomain.com.sg      Local NS list does not match Parent NS list       
      dns       mydomain.com.sg      Name Servers are on the Same Subnet       
      dns      mydomain.com.sg      Primary Name Server Not Listed At Parent       
      dns      mydomain.com.sg      SOA Serial Number Format is Invalid       
      dns       mydomain.com.sg      SOA Expire Value out of recommended range      

Could you kindly explain me how can I fix those warnings? Thank You.
Sandar Min AyeAsked:
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Amit KumarCommented:
You are actually checking in wrong way. mail.mydomain.com.sg is your OWA/mail server DNS, which does not host MX recrods.

Check with mydomain.com.sg on mxtoolbox. If you dont have any issue provide your domain name will share the correct results.
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Sandar Min AyeAuthor Commented:
Actually, my domain name is "rmagroup.com.sg".
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Sandar Min AyeAuthor Commented:
I just solved for Reverse DNS does not match SMTP Banner .
1
Making Bulk Changes to Active Directory

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Amit KumarCommented:
Just checked now things are good with your PTR and MX record. Just to tell you one more thing. I have found you have not added your mx record in SPF but you have included All.

Please add mail.rmagroup.com.sg to your SPF, and you can also add IP as well.
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Sandar Min AyeAuthor Commented:
Is it like v=spf1 mx a ip4:58.185.184.114 ~all ?
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Amit KumarCommented:
Yes almost, you need to change TXT record for your domain:

v=spf1 mx ip4:58.185.184.114 include:mail.mydomain.org ~all
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Amit KumarCommented:
Presently your TXT record is like:

v=spf1 mx a ?all

Change it to specific IP and DNS.
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DrDave242Commented:
v=spf1 mx ip4:58.185.184.114 include:mail.mydomain.org ~all
There's no need to put all of that in there. The ip4: mechanism is redundant in this case, and the include: mechanism won't work. The way everything is configured right now, the only thing that needs to be in the SPF record is this:

v=spf1 mx ~all

This translates to "The machine(s) listed in my domain's MX records are allowed to send mail on behalf of my domain. Any other machine sending mail on our behalf will generate a softfail response." If you've got one mail server that handles both inbound and outbound mail, and it's the server that's listed in your domain's MX record, that's all you need in the SPF record.
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Sandar Min AyeAuthor Commented:
I am sorry for late reply.

Now, My DNS records look like as below.

Name                                      Type                    Data
(same as parent folder)       MX                       [10] mail.mydomainname.com.sg
(same as parent folder)       TXT                      v=spf1 mx ~all
mail                                         MX                       [10] mail.mydomainname.com.sg
mail                                         TXT                      v=spf1 mx ~all

I would like to know that do I need to create MX and TXT record for mail (mail.mydomainname.com.sg)?

Thank you for your help.
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DrDave242Commented:
I would like to know that do I need to create MX and TXT record for mail (mail.mydomainname.com.sg)?
No, those aren't needed. Only the "(same as parent folder)" MX and TXT records are used. I'm assuming that there's also a host record that maps mail.mydomainname.com.sg to an IP address, as this is needed as well.
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