SMTP：用来发邮件的（在RFC上代号2821） IMAP：用来收邮件的（在RFC上代号1730） 还有一个POP3协议，也是用来收邮件的， 是IMAP协议的前身，但支持功能较少，现在基本没用了。 每个协 …

Feb 26, 2026 · Reply codes The SMTP reply codes refer to specific parts of the email service, and can indicate issues like: The intended recipient isn't registered with the service. The message was …

2、Exchange ActiveSync Exchange Server支持SMTP、POP3、IMAP4等多种电子邮件协议，当然我们也设计自己的协议并得到大量厂商的支持，那就是Exchange ActiveSync。 Exchange ActiveSync 是 …

SMTP命令：QUIT 这一步非常简单，就是发送一条QUIT命令，QUIT命令发送完毕后，还是要判断服务器的返回码是否为250。 如果返回的不是，则表明发送失败，SMTP服务器可能不会将邮件转发到收件 …

This article is for Google Workspace administrators who want to send email from devices or apps in their organization or domain. If you're a Gmail user who wants to send email from a device or app, contact …

It's easiest to use Gmail on multiple email clients using IMAP. If you need to use POP instead of IMAP, set up "Recent mode." Recent mode shows your last 30 days of emails from Gmail. In your email …

Feb 26, 2026 · gsmtp (Google SMTP) is added to all errors. gcdp (Google Custom Domain Policies) is added to errors resulting from customized rules created by a Google Workspace administrator.

Cet article s'adresse aux administrateurs Google Workspace qui souhaitent envoyer des e-mails à partir d'appareils ou d'applications de leur organisation ou de leur domaine. Si vous êtes un utilisateur …

Sent messages are automatically copied to the Gmail/Sent folder if your email client uses SMTP. Save draft messages on the server if you want your drafts to show when you open Gmail on the web. Don't …

On your computer, open Gmail. In the top right, click Settings See all settings. Click the Accounts and import or Accounts tab. In the "Send mail as" section, click Add another email address. Enter your …