Sometimes you’ll open your email client and your email will arrive in your inbox, but when it comes to sending a message you get an error message. Below are a few steps to follow for Outlook/Thunderbird on how to fix this problem.
Outlook Express
1) Go to Account Settings (Tools > Accounts)
2) Click on the “Mail” tab
3) Highlight your GreenNet email account, and then click on “Properties”
4) On the “Servers” tab, check that you are using GreenNet’s SMTP server. Outgoing mail (SMTP) should read “smtp.gn.apc.org”
5) Make sure there is a tick in “My server requires authentication” (the “Settings” should be “same settings as incoming).
6) Next, click on the Advanced tab, under ‘Server Port Numbers’ change the Outgoing mail server port from 25 to 2525 or vice versa, depending on which one you have there already.
7) Save your changes and try sending email again.
This problem is usually due to ISPs or the network you are on blocking access to port 25 or 2525 normally because of spam being sent via their network. Although it’s very inconvenient when it is blocked, the steps above should allow you to get around the issue. It’s also a good idea to use secure connection (TLS) when available.
