Email not being sent with domain

[#1]

It would be handy to share those Greenby instructions,  they could help all the others facing the same situation.

[#2]

I will copy and paste them later. It’s working now simply because:

1) it is necessary to log into RoundCube with your actual email address, not your Plusnet username.

2) conversely, when logging into the Greenby account portal the Plusnet username has to be used. Therefore don’t access webmail via that because it’s the wrong username. At least that’s what I’ve deduced. Hope it makes sense. 

[#3]

Here is the support email from Greenby:

The domain ******.co.uk is set up as an alias mapped to your primary domain *****.f9.co.uk.

When setting up your email client or logging in to webmail at https://webmail.greenby.com/:

Username: Use your full email address (e.g. the domain email address).

Password: Use your standard mailbox password.

Please note that the underlying email account corresponds to your Force9 account. If login fails or you are unable to authenticate, you can easily reset your mailbox password via your Greenby dashboard here:

https://greenby.com/email/453811/mailboxes

Once reset, update your email program with the new password alongside your full email address as the username for both incoming and outgoing server authentication.

I'm now on the naughty step with the iCloud and Windows password managers because the password is the same as Force 9 so has been used three times but I've had enough for now so the remedy will have to wait. One good thing is that when I was in the Greenby account portal I took the opportunity to remove some of the aliases that I have used in the past and no longer need. 

[#4]

@SteelCity1 

so does that mean that in the greenby portal you have force9 mailbox and a separate mailbox for you domain?

[#5]

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@PhilipHeyes wrote:

@Townman 

As Yoda might say ... That confirmation, find I expect you will. 

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It has indeed been confirmed.

The sending email address MUST be configured on the Greenby portal.  That means sending 'from' a third party domain email address via Greenby's services is not permitted.  Time to use the email services of the party who hosts the domain name.

[#6]

If Only want to use my domian and don't care about my old plusnet address. Do i just need to create a new maiilbox in greenby and set that as the catchall instead.

[#7]

If "my domain" was hosted by Plusnet there is nothing you need to do.

If the domain is hosted elsewhere and forwards emails to the Plusnet address and you have been in the habit of SENDING using that domain name via Plusnet, that will not now work.  There is fair argument that was an abuse of Plusnet's mail servers by relaying third party emails.

You can only "fix" this by sending "my domain" emails via "my domain"'s hosting provider.

CATCHALL relates to receiving inbound email, not sending emails.