No matter which SMTP port you use your mails will be sent in exactly the same way.
We recommend using the SMTP port 2525 because the default 25 might be blocked by your local Internet service provider.
More information on how to change the SMTP port for the most popular mail clients (such as Outlook and Thunderbird) can be found in our Email tutorial.
SiteGround's servers are using state of the art spam protection system with custom ACL filters which will ensure you will avoid the spam and at the same time never miss your important emails. If you wish to have unlimited mail accounts and stable mail service, you may sign up for an account at SiteGround.