Recently I got email from one of the blog reader that he is getting below error while setting up SQL MAIL as legacy feature in SQL Server 2008.
SQL Mail does not work with the 64-bit version of SQL Server (Microsoft SQL Server, Error: 17938)
SQL Mail is not supported on 64-bit versions of SQL Server. SQL Mail stored procedures cannot be installed on 64-bit versions. If you want to still use it you have to go with the 32-bit edition or start using database mail, which is more easy.
Follow below article link to start converting your SQLMAIL to DB Mail.