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.
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!