Windows 10 will reach EOS (end of support) on October 14, 2025. For more information, see this article.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

The mail server sent an incorrect greeting: smtp687.syd.oss-core.net.

more options

So all of a sudden, with no changes from my side, i can no longer send emails from Thunderbird OR windows live mail which was sitting dormant until i revived it after having this Thunderbird email issue! I can receive emails but not send, i simply get this message: "The mail server sent an incorrect greeting: smtp687.syd.oss-core.net"

None of my 4 emails work now! Please help!!

Cheers, Bill

So all of a sudden, with no changes from my side, i can no longer send emails from Thunderbird OR windows live mail which was sitting dormant until i revived it after having this Thunderbird email issue! I can receive emails but not send, i simply get this message: "The mail server sent an incorrect greeting: smtp687.syd.oss-core.net" None of my 4 emails work now! Please help!! Cheers, Bill

All Replies (1)

more options

So you have 2 different email clients failing. Sounds like you need to call your provider and see what changes you need to make.