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Click on Account Settings (usually on the Tools menu).The message could not be sent because the connection to SMTP server smtp.gn.apc.org timed out.” The usual symptom is that Thunderbird will try to send for about 20 seconds before giving up with “Sending of message failed. Other causes for not being able to send include an invalid recipient address: it’s usually worth recording any error message you see on screen, however cryptic. Instructions for changing the port (and sometimes which port to use) may vary depending on the exact version of the email program you are using, but the following covers most of the common ones. This is particularly likely to occur when travelling and connecting through a different ISP from normal, because the ISP may block outgoing ports as a safeguard against their connections being used to send spam. (If you’ve come here from a web search and use an email service other than GreenNet, the server names will be different depending on your email provider, and maybe some of the port numbers too.) All the settings mentioned are for GreenNet users. Here are the steps to follow for Outlook, Thunderbird etc to fix this. 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.
