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If you are receiving a message such as "Unable to connect to outgoing mail (SMTP) server", it could be because your ISP is blocking the sending of mail to 3rd party e-mail providers such as Suso.

To fix this, you can go into your e-mail settings and and turn on SSL mode for SMTP e-mail sending and make sure the port number is set to 465. You also need to make sure you are using authenticated SMTP.

The reason why some ISPs block the default port (port 25) for sending e-mail is because there has been a problem with computers becoming infected with viruses and then sending out spam e-mail to open relay mail servers across the Internet. In order to combat this problem, ISPs have begun blocking outgoing mail that is not going to their own mail server. They will not usually block port 465 because that port is usually associated with authenticated SMTP, which the viruses would not use.

There are however a few ISPs that are blocking both port 25 and 465. If that is the case, you can try using port 587, which is the mail submission port. If you do this, you will need to turn off SSL mode and instead turn on TLS encryption. Please contact us if you need help doing this for your Suso account.