Question about Outlook Express

When I attempt to send an email, it goes to the outbox and sits there. When I attempt to send it again, I get a bit of a delay and then an error message that looks like this:

The message could not be sent because the server rejected the sender's email address. The sender's email address was *** Email address is removed for privacy ***'.

Subject 'Re: How was your day?'
Server Error: 550
Server Response: 550 5.7.1 <*** Email address is removed for privacy ***>... Too many invalid recipients.
Server: 'smtp.sasktel.net'
Windows Live Mail Error ID: 0x800CCC78
Protocol: SMTP
Port: 587
Secure(SSL): No

What is wrong? What does Error 550 mean?

I have Googled this problem and tried quite a few suggestions with no luck. I already tried the Windows Essentials repair in the Control Panel.

[Original subject: Windows Live Mail. Can receive emails but can NOT reply or send emails]

When I attempt to send an email, it goes to the outbox and sits there. When I attempt to send it again, I get a bit of a delay and then an error message that looks like this:

The message could not be sent because the server rejected the sender's email address. The sender's email address was *** Email address is removed for privacy ***'.

Subject 'Re: How was your day?'
Server Error: 550
Server Response: 550 5.7.1 <*** Email address is removed for privacy ***>... Too many invalid recipients.
Server: 'smtp.sasktel.net'
Windows Live Mail Error ID: 0x800CCC78
Protocol: SMTP
Port: 587
Secure(SSL): No

What is wrong? What does Error 550 mean?

I have Googled this problem and tried quite a few suggestions with no luck. I already tried the Windows Essentials repair in the Control Panel.

I have a new Windows 10 computer.  I paid someone to transfer my Windows Live email information.  The individual entries transferred ok.  The groups did not.  When I try to address an email to a group the group shows up with a plus sign before the name of the group and then the program says there are no email addresses in the group.  Help

[Original subject: Windows Live Mail]

I'm using Windows 8 and have version "2012 (Build 16.4.3564.1216" and don't have an upgraded account.

I reinstalled Windows Live after my emails stopped updating in the application.  I re-added my mail accounts and it started working again and my emails started flowing through. 

I noticed in the last few weeks ago when I moved a number of mails between folders offline that these mails weren't moved when I logged onto outlook.com online.  I've checked the synchronisation settings of all the folders and they are ok, so I'm at a loss why there is a discrepancy between my offline folders and online folders.

Can anyone help?

Caroline

Live Mail 2012 has been working perfectly in Windows 10. But suddenly this morning, it will not load. It shows "starting" continuously. What happened?

I also cannot load Chrome though Firefox opens fine.