DKIM disabled at Microsoft Exchange due to missing CNAME records

masplin · ‎03-02-2010

Hi

i'm getting emails bounced back from my perosnal domain asplins.co.uk hosted on plusnet from specifically yahoo receipients. This is the error

Remote server returned '550 5.4.300 Message expired -> 451 This mail has been deferred because the sender is sending too much mail for its authentication status. Please set up DKIM aligned to the From: domain. See https://senders.yahooinc.com/smtp-error-codes#authentication-failures for more information.'

On my Microsoft exchange account i can see my perosnal domain asplins.co.uk the DKIM is disabled. If I try to enable it is says i need to add 2 CNAME records to the DNS

Hostname: selector1._domainkey
Points to address or value: selector1-asplins-co-uk._domainkey.asplins.onmicrosoft.com

Hostname: selector2._domainkey
Points to address or value: selector2-asplins-co-uk._domainkey.asplins.onmicrosoft.com

Is this possible on Plusnet as seems not? If so how do left and field relate to the entries?

Thanks for any advice

Townman · ‎22-08-2007

You should be able to add CNAMES in the user portal - see manage my account -> manage my domain. The help page advises...

Canonical name (CNAME) records

'CNAME' records allow a machine to be known by more than one hostname. There must always be an 'A' record for the machine before 'C' names can be added.

You should make sure:

That the canonical name (nominated on the right) is fully qualified (FQDN)
If the canonical name doesn't have the full stop at the end, the DNS will add the Top Level Domain on again. This will make the domain name wrong. (E.g. 'house.domainname.co.uk' would become 'house.domain.co.uk.domain.co.uk').

In another browser tab, login into the Plusnet user portal BEFORE clicking the fault & ticket links

Superusers are not staff, but they do have a direct line of communication into the business in order to raise issues, concerns and feedback from the community.

If this post helped, please click the Thumbs Up and if it fixed your issue, please click the This fixed my problem green button below.

masplin · ‎03-02-2010

Yes but whcih bit is LEFT and which bit is right?

Townman · ‎22-08-2007

Does this help - CNAME record - Wikipedia

In another browser tab, login into the Plusnet user portal BEFORE clicking the fault & ticket links

Superusers are not staff, but they do have a direct line of communication into the business in order to raise issues, concerns and feedback from the community.

If this post helped, please click the Thumbs Up and if it fixed your issue, please click the This fixed my problem green button below.

masplin · ‎03-02-2010

I'm scared of breaking my email so reluctant to just give it a go without being clear which bit goes in left and which bit in right!!!

Appreciate the help.

MisterW · ‎30-07-2007

@masplin Hostname is the left , value is right.

I'm scared of breaking my email so reluctant to just give it a go without being clear

I would expect its pretty failsafe, Exchange won't enable DKIM until the correct records show in your DNS

Superusers are not staff, but they do have a direct line of communication into the business in order to raise issues, concerns and feedback from the community.

masplin · ‎03-02-2010

much appreciated

masplin · ‎03-02-2010

ah you cant enter the required text in the left field. doesnt like the underscore in selector1._domainkey