
Hoping someone can throw light on this issue for a Linux newbie. I'm running Ubuntu Server 12.04LTS and accessing the web via DHCP client on a Netgear router/modem. DNS service is provided through Dyndns.org Basic website is accompanied by a Moodle site which is the main focus of my operation. (support learning and teaching for U3A group) All features and functions of Moodle are operative however email cannot be sent or received. My previous experience with Moodle sites has not relied on this DNS service and I have no idea what influence their operation has on the handling of email. If someone is familiar with all the links in this chain I would appreciate some explicit advice. Cheers, Rob

Rob Rankin <rrankin@bigpond.net.au> wrote:
All features and functions of Moodle are operative however email cannot be sent or received. My previous experience with Moodle sites has not relied on this DNS service and I have no idea what influence their operation has on the handling of email.
Are you sure your ISP isn't blocking port 25, which could effectively prevent your system from sending or receiving mail directly? Internode, for example, blocks port 25 by default, but there's an option to disable this on their Web site.

On 11/09/2013 4:21 PM, Jason White wrote:
Rob Rankin <rrankin@bigpond.net.au> wrote:
All features and functions of Moodle are operative however email cannot be sent or received. My previous experience with Moodle sites has not relied on this DNS service and I have no idea what influence their operation has on the handling of email. Are you sure your ISP isn't blocking port 25, which could effectively prevent your system from sending or receiving mail directly?
Internode, for example, blocks port 25 by default, but there's an option to disable this on their Web site.
_______________________________________________ luv-main mailing list luv-main@luv.asn.au http://lists.luv.asn.au/listinfo/luv-main
ISP is Telstra. Port forwarding in firewall has port 25 (SMTP) open for the server's IP address.

On 11/09/2013 6:05 PM, Rob Rankin wrote:
ISP is Telstra. Port forwarding in firewall has port 25 (SMTP) open for the server's IP address.
Okay, well unless you have a service that specifically supports you hosting a mail server, then Telstra will block port 25 incoming for sure, port forwarding on your modem/router equipment won't help if the port is blocked at the ISP level (which I would be sure it is). Secondly, with your DNS, have you setup MX record(s) ? You need at least one MX record. You can also test your domain with this website: http://mxtoolbox.com/ I am not affiliated in any way with the above site, they have other testing services too. Kind Regards AndrewM

Andrew McGlashan writes:
Secondly, with your DNS, have you setup MX record(s) ? You need at least one MX record.
Wrong. https://en.wikipedia.org/wiki/MX_record#History_of_fallback_to_A | RFC 5321 sec. 5 now clearly states that: | | 1. SMTP clients must look up for an MX record; | 2. if no MX record for domain is present, look up for an A Resource | Record (RR), and if such record is present, treat it as an MX | record; | 3. if an MX record is present, clients MUST NOT use an A RR.
You can also test your domain with this website:
Or, you know, dig.

On 11/09/2013 8:41 PM, Trent W. Buck wrote:
Andrew McGlashan writes:
Secondly, with your DNS, have you setup MX record(s) ? You need at least one MX record.
Wrong. https://en.wikipedia.org/wiki/MX_record#History_of_fallback_to_A
Okay, that's interesting, thanks. There has been talk in the past of using MX records in a number of ways, that can't be achieved with A records alone. Having a secondary or backup mail server, for instance, which is of questionable value these days; but that is just one reason why you might have multiple MX records. Cheers A.

On 11/09/2013 6:22 PM, Andrew McGlashan wrote:
On 11/09/2013 6:05 PM, Rob Rankin wrote:
ISP is Telstra. Port forwarding in firewall has port 25 (SMTP) open for the server's IP address. Okay, well unless you have a service that specifically supports you hosting a mail server, then Telstra will block port 25 incoming for sure, port forwarding on your modem/router equipment won't help if the port is blocked at the ISP level (which I would be sure it is).
Secondly, with your DNS, have you setup MX record(s) ? You need at least one MX record.
You can also test your domain with this website:
I am not affiliated in any way with the above site, they have other testing services too.
Kind Regards AndrewM
_______________________________________________ luv-main mailing list luv-main@luv.asn.au http://lists.luv.asn.au/listinfo/luv-main
MXtoolbox reports that ports 25,80 & 110 are open

Is this server running on dyndns? If so you have to check that the old data isn't being cached. How is email not working? Can't send to server? Can't receive mail from the net? Can't send from server to another server? -- Sent from my Samsung Galaxy Note 2 with K-9 Mail.

On 11/09/2013 4:25 PM, Russell Coker wrote:
Is this server running on dyndns? If so you have to check that the old data isn't being cached. Don't understand this question. Server is located in my home with web access through dyndns.
How is email not working? Can't send to server? Can't receive mail from the net? Can't send from server to another server? Can't send or receive mail from server. Have tried to set up various email clients in Ubuntu but without success. Email function in Moodle is normally handled by PHP when server has direct web access.
participants (5)
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Andrew McGlashan
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Jason White
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Rob Rankin
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Russell Coker
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trentbuck@gmail.com