on 03-08-2021 11:08 AM
I use a lineone email address and have updated my email settings to avoid issues with the tiscali servers. I'm receiving emails fine now but am having problems sending. My email client gives the following message:
An error occurred while sending mail. The mail server responded: 5.1.0 ArH9mYM3X2YhL Sender Domain Invalid (TT420). Please verify that your email address is correct in your account settings and try again.
My email address is definitely correct.
on 03-08-2021 04:20 PM
The underlying cause of the mail servers not being resolved by the DNS is fixed. So, all should be good. The settings you showed were perfect and I'd have expected them to work. for a few users they did but for others not. So that's a mystery that we'll probably not know the answer to.
But as long as you're back in action using the settings you showed that's just fine.
on 03-08-2021 04:07 PM
All is fixed now. I've changed nothing and the error message "Sender Domain Invalid (TT420)" is no longer appearing when I send so it looks like the outgoing server has been fixed.
For what it's worth, I don't have any saved logins, and when I mistype the password, I get a different error.
on 03-08-2021 01:02 PM
on 03-08-2021 12:20 PM
Thanks for looking at this. I've attached my server settings below with personal info redacted, hopefully! My client is Thunderbird.
I'd prefer to not use a separate user name and password for the outgoing server as I already have enough accounts and passwords to remember!
Incoming server settings
Outgoing server settings
on 03-08-2021 11:42 AM
Take screenshots of the email client incoming / outgoing and advanced settings, obscure the first part of your email address and upload here using the Camera icon above this reply area or picture icon if using a mobile device. I'll take a look.
Normally, it's because the wrong outgoing server is selected or the required secure authentication isn't carried out. I find it's best not to use the same settings as the incoming server but use a separate username and password for the outgoing server.