Support by service : Frequently Asked Questions about Enterprise Mail

Service menu support information

Service menu support information

Questions

[Enterprise Mail] Due to the limitations of the Internet Connection Provider (ISP), I am not able to send an e-mail using the SMTP port (TCP25).

Answer

Unfortunately, it cannot be used to Submission port.
It will be available only SMTPS port(TCP465) when you access via Internet. In addition, SMTP-AUTH is also mandatory if you access through the Internet.