topic Re: Domain name not on certificate in Email

Domain name not on certificate

Tracy87 — Tue, 18 Jun 2024 06:54:36 GMT

I own my own domain name and forward this through my Sky account so I never need to change my email address if I change providers but when I try to add it on Outlook I get the following message:-

Your email service provider does not provide the
option of logging in using a secure connection for
IMAP.
n order to establish a secure connection, youl
email server must provide a certificate to Outlook in
order to prove its identity. The certificate that your
email server is providing is valid. However, the
domain name (the portion of your email address
that appears after the @ symbol) is not listed in the
ertificate. Without this, Outlook cannot guarantee
that you're connecting to your email server.
You might still be able to connect, but your
connection will not be secure. This is a problem
with your email service, so you'll need to contact
your IT Admin or email service provider to resolve
this issue. Please let them know that their email
domain presented does not match the common
name or subject alternate names (SANs) in their
certificate. Please note that the Outlook Mobile
Support team is unable to resolve this issue for you

Re: Domain name not on certificate

caesarome — Tue, 18 Jun 2024 08:33:39 GMT

Have you followed the advice in that message and contacted your domain provider about this ?

Re: Domain name not on certificate

Mark39 — Tue, 18 Jun 2024 08:38:04 GMT

I don't know how you can correct,this. One of the other forum Superusers, @jayach, may know more about how domain names work.

If resolution requires Sky's involvement, I would think it highly unlikely thay they'll be able to help. Practically, you might be better off choosing a different email app or client.

Re: Domain name not on certificate

jayach — Tue, 18 Jun 2024 10:41:50 GMT

Unfortunately I don't really understand the error message either, however if you have your own domain, why do you need to involve Sky at all? Are you trying to send via Sky's SMTP server?

Re: Domain name not on certificate

caesarome — Tue, 18 Jun 2024 10:54:16 GMT

The way I read it (and I might be wrong) is that @Tracy87 has her Sky email collect her domain emails.

Re: Domain name not on certificate

Tracy87 — Tue, 18 Jun 2024 14:16:42 GMT

I have my own domain but I'm not an Internet provider so it's routed through my Sky email.

Any incoming mail is fine but if I send an email it goes out from my Sky address as it won't let me set up the one with my domain due to the error message I attached earlier.

I have rang Sky in the past and they didn't have a clue what I was on about.

Re: Domain name not on certificate

caesarome — Tue, 18 Jun 2024 17:08:06 GMT

Do you have access to a SMTP server with your own domain as it isn't clear if you do or not ?

Im not sure if you can use your Sky email account to send emails from another domain like you are trying to do.

Re: Domain name not on certificate

Tracy87 — Tue, 18 Jun 2024 17:46:22 GMT

@caesarome no just the Sky SMTP but I used to be able to send emails.

Maybe easier just to set up a Gmail account and try it that way 🤷🏼‍♀️

Re: Domain name not on certificate

jayach — Tue, 18 Jun 2024 20:11:49 GMT

Assuming you are saying you are trying to use the Sky SMTP server to send emails, that always used to work, but you had to authenticate using your Sky credentials and register your domain email address with the server, however the error message is complaining about the IMAP server, which would not be Sky.

@Tracy87 wrote:
I try to add it on Outlook I get the following message:-

Your email service provider does not provide the
option of logging in using a secure connection for
IMAP.

You say it used to work. Was that also with Outlook and are you sure you are configuring it the same?

Is it Outlook on desktop or mobile?

Re: Domain name not on certificate

Tracy87 — Tue, 18 Jun 2024 20:29:07 GMT

@jayach yes it used to work with Outlook on my laptop but then suddenly stopped and can't get it to work at all on my mobile.

Re: Domain name not on certificate

jayach — Tue, 18 Jun 2024 20:52:32 GMT

@Tracy87 wrote:
@jayach yes it used to work with Outlook on my laptop but then suddenly stopped and can't get it to work at all on my mobile.

I've just tested and I can still send using a different domain email address via the Sky SMTP server using Outlook on desktop.

However it does need the domain email to be registered with the Sky server, and it does need to use a generated password, not your Sky email account password. And I'm using an old version of Outlook .

As for Outlook on mobile I suspect it may be difficult to configure due to the "locked down" nature of that app. As I said the error message you showed seems to be complaining about the IMAP server not the SMTP one.

Re: Domain name not on certificate

Tracy87 — Tue, 18 Jun 2024 20:56:52 GMT

@jayach so I probably need to get in touch with Sky and get them to add my domain name to their certificate of security?

Re: Domain name not on certificate

jayach — Tue, 18 Jun 2024 21:25:22 GMT

@Tracy87 wrote:
@jayach so I probably need to get in touch with Sky and get them to add my domain name to their certificate of security?

No, they wont have a clue what you are asking.

It is done via the "Send-only email address" in the configuration within your Sky email settings.

And if you say it used to work, it must already be set up.

Do you have anything set up on your Sky email settings there?

Re: Domain name not on certificate

Tracy87 — Wed, 19 Jun 2024 07:53:08 GMT

@jayach it just stopped working over night so I figured it must be something that Sky had done.

It's all getting a bit technical now and going over my head and it's hard to explain in a message. Might give my domain provider a call, they should definitely know what's going on.

Re: Domain name not on certificate

jayach — Wed, 19 Jun 2024 08:43:17 GMT

@Tracy87 wrote:
Might give my domain provider a call, they should definitely know what's going on.

Sounds like a good idea, they will probably supply an SMTP service for a small fee, and then no need to involve Sky at all.

Re: Domain name not on certificate

W0lfgang — Mon, 05 Jan 2026 22:36:22 GMT

I know this is old but I'm having a problem sending emails via my sky account from another domain email address. It's worked until recently but now sent emails are being rejected by the yahoo mailer-daemon. I found this thread but that ability to set other sender addresses does not appear to exist any more. Can you tell me where it is now if it does still exist? Thanks.

Re: Domain name not on certificate

jayach — Tue, 06 Jan 2026 02:08:43 GMT

@W0lfgang

Yes it does still exist, where I showed previously.

https://helpforum.sky.com/t5/Email/Domain-name-not-on-certificate/m-p/4670808#M100356

You will find it under Settings - More settings - Mailboxes. Use a desktop browser, not a mobile device.

I've just added another address and it does still appear to work, although I had to try it a couple of times to get it to verify.

Re: Domain name not on certificate

W0lfgang — Tue, 06 Jan 2026 14:37:48 GMT

Thanks for the quick reply. Desktop browser required, of course. However, the email adddress I'm having a problem with is there in the list of send only addresses and has been working for years until very recently. Yahoo must have changed something. Now when sending with that email address emails are rejected with

MAILER DAEMON at yahoo.com www.yahoo.com

From:mailer daemon at yahoo.com

To:send only email address

(exact addresses bodged as it wouldn't let me post the message otherwise)

Sorry, we were unable to deliver your message to the following address.

<another email address>:

550: 5.7.26 Unauthenticated email from xxx.org.uk is not accepted due to

5.7.26 domain's DMARC policy. Please contact the administrator of

5.7.26 xxx.org.uk domain if this was a legitimate mail. To learn about

5.7.26 the DMARC initiative, go to

5.7.26 https://support.google.com/mail/?p=DmarcRejection ffacd0b85a97d-432bd617915si451262f8f.374 - gsmtp

I've checked and xxx.org.uk does have a valid DMARC policy.

I'll probably start a new thread.

Re: Domain name not on certificate

jayach — Tue, 06 Jan 2026 14:54:31 GMT

@W0lfgang

All the large email organisations (Microsoft(Outlook), Gmail and Yahoo) have been tightening up their anti-spam measures recently, and problems such as this are cropping up regularly. The organisations seem to correct the errors eventually but it can take a while.

Out of interest, what domain are your failing emails coming from?

Possibly re-adding the forward rule would get it working again?

Re: Domain name not on certificate

W0lfgang — Thu, 08 Jan 2026 13:14:29 GMT

Thanks for the suggestion. I'll try deleting and recreating the send-only email as well.