I have searched the Interent over for a solution to this problem. My error message lists Port 25 as the problem.
I use Windows Mail and McAfee antivirus software. I've gone into the virus software and unblocked Port 25. I have also changed my email addresses to Port 587 as recommended by Verizon but that didn't work either.
I have several email accounts included Verizon and other accounts that work fine with Port 25. I only have one that is not working with Port 25.
Error exists between keyboard and chair.
Thanks Spacedebris! This worked. My email used to work properly for but suddenly after several months of working fine, I started receiving the error message.
I use Windows Mail and did the following to fix it:
Go to Tools, Accounts and select the account you want to modify then select Properties.
Select the Servers tab.
Check the box that says "My server requires authentication"
In my case I had to choose "Log on using"
Enter user name and password for the email account.
Make sure "Remember password" is checked.
Select OK then Apply.
Thansk for the help!