Flummoxed by DNS/MX settings

[999]

I am absolutely tearing my hair out with this one:

I have a domain name that I have set to a DynDNS address but left the MX records as they are, at 123-reg. I can connect to the machine pointed to by the DynDNS address using the domain name. I have set up email forwarding at 123-reg to forward to another address but any mail sent to the domain name gets returned with this error:

550-Verification failed for [address forwarded to]
550-Unrouteable address
550 Sender verify failed

I know the [address forwarded to] works because it is my primary email address. Any suggestions would be gratefully received as I am convinced I am losing emails...

TIA

 

[Rob7865]

HI 999

Where are the name servers for the domain pointing? To the DynDns or 123reg?

Should just be a case of setting the NS to point to DynDns (if they allow it), and then point the MX record(s) back to 123reg.

Should also be able to do it another way (NS at 123reg, with an A name pointing to the DynDNS and leave the MX record(s) at 123 to thw A name - i.e. A =123.123.123.123 - mail.somedomain.com; MX= mail.somedomain.com).

Hope I have understood what your trying to achive?!

TTFN
Rob

 

[Tui]

Can you confirm the details ...

You have a domain and the MX records for this point to a 123-reg mail host?

You've configured 123-reg mail forwarding so that above e-mail is forwarded to another domain? Does this domain also have MX records and a valid mail host?

Which mail server is giving these errors, 123-reg mail server?

 

[999]

Right,

using 123-reg nameservers,

the CNAME record called 'www' is pointing to the dynamic address,

the MX records are set as the 123-reg ones,

123-reg set to forward all email at this domain to another domain [domain2],

it is the mail server at domain2 giving the error.

Thanks-I realise I may have made this overly complicated, but I am unsure how to uncomplicate things again...

Can you confirm the details ...

You have a domain and the MX records for this point to a 123-reg mail host?

I believe so.

You've configured 123-reg mail forwarding so that above e-mail is forwarded to another domain?

Yes.

Does this domain also have MX records and a valid mail host?

I assume it does, because I get all my email through it ie. it works already.

Which mail server is giving these errors, 123-reg mail server?

Nope, it's a separately hosted site/mail server.

 

[Tui]

Google search has lots about this error.
It looks like some kind of checking is done on your separately hosted site/mail server on the senders address.
So, does the sender From: domain exist? Is there valid MX records for this domain - that means the mail server entry is a host name, not an IP address, and is not a CNAME for something else?

 

[Ol!ver]

Did you get this sorted? I've got the same error. Always had my email forwarded from 123-reg to myg mail account. I've just changed the name servers to point to my web hosting and now my email isn't working.