Yahoo & Alias issues

Mail
1

Hi there, I have my own domain name, I have an email forwarding set up from the domain to provider (currently BT)… so myemail@mycomain forward to [email protected]. When I send emails from emclient, everyone sees that it comes from myemail@mydomain as I have set up the email & alias as myemail@mydomian…

Now I am about to move from BT to Yahoo, when I mimicked this set up I get this error

[SMTP] Cannot send message (‘From’ field address ‘meemail@mydomain’ not accepted due to the following reason:
"Request failed; Mailbox unavailable
")

Any ideas what is causing this?

Thanks in advance

2

Dies ist eine schlechte Wahl, die britische Abteilung unseres Unternehmens hat Yahoo verlassen, um zu BT zu gehen, weil es so viele Probleme mit Yahoo gab

Grüße
Grüße
Torsten

3

I have to leave BT email as I wont be BT customer anymore,

Happy for any suggestion on who is good for free email? yahho / gmail / AOL / outlook / Proton / Yandex / zoho / …etc