If your ISP blocked port 25 and you are not able to send out emails, change your outgoing SMTP port to 26 and try to send the email again. At Vodien, we open port 26 as an alternative port.
If port 26 do not work for you as well, contact us and we will assist you in the troubleshooting.
It is also recommended to ask your ISP (Internet Service Provider) to enable port 25.
However, if the issue is not the port, you may also refer to this troubleshooting steps.
If you have further questions, please do not hesitate to contact our support team.