iRedMail邮件服务器端口

* POP3 service: port 110 over STARTTLS (recommended), or port 995 with SSL.

• IMAP service: port 143 over STARTTLS (recommended), or port 993 with SSL.
• SMTP service: port 587 over STARTTLS.
• 常用的端口(SMTP: 587, POP3: 995, IMAP: 993)