Change default smpt port to 465 (default smtps port)

王权利请求将github/fork/bozaro/smtp-port合并到master

Created by: bozaro

Current default value 456 is confusing. It differ with default SMTPS port number 465 only by digits order. I think it's good idea to change this value to some correct SMTP port number (25 or 465).

合并请求报告