이 도움말의 대상 ; 다음은 조직 또는 도메인의 기기나 앱에서 이메일을 보내려는 Google Workspace 관리자를 위한 도움말입니다. 기기 또는 앱에서 이메일을 보내려는 Gmail 사용자는 조직의 관리자에게 문의하세요.
Due to absence of a proper authentication mechanism, by design every SMTP server was an open mail relay. The Internet Mail Consortium (IMC) reported that 55% of mail servers were open...
The transmission details are specified by the Simple Mail Transfer Protocol (SMTP). When a... [6] See also [edit] List of mail server software Relay (disambiguation) References [edit] ^ MTA...
When you use the SMTP relay service to send Gmail through Google servers, Google monitors outgoing messages. If Google detects large amounts of spam being sent from your registered or non-registered user accounts, you might get an email alert about the issue. Non-registered user accounts are accounts that: After 24 hours, if a Gmail account is still sending spam, the account is suspended. You'll get an email alert letting you know about the suspension. Restore suspended accounts when the issue is resolved. We recommend you keep non-registered a ...
spam software to malfunctioning relay servers, or any problems that may truncate header lines from the message body. Some spam may appear to be blank when in fact it is not. An example of...
Setting options, What to do ; Allowed senders, Choose an option: Only registered Apps users in my domains —Sender must be a Google Workspace user in one of your domains. Only addresses in my domains —Sender doesn't have to be a Google Workspace user, but must be a user in one of your registered domains. This option is useful when you use third-party or custom applications to send messages. Any addresses (not recommended) —Sender address can be any email address, including addresses outside of your domain. This option makes you more vulnerable to abuse, either by malicious software on your users' devices or by incorrect SMTP settings. If you use the any address option and send messages from a domain that you don't own or with an empty envelope-from (for example, bounce messages or out-of-office notifications), set up your mail server to use SMTP AUTH to identify the sending domain or to present one of your domain names in the HELO or EHLO command. If the sender is not in one of your domains, the system changes the envelope sender from user@domain_you_don't_own to postmaster@your_domain , where your_domain is the domain the system receives from SMTP AUTH or from the HELO or EHLO command. When the address provided in the MAIL FROM SMTP command belongs to a registered Google Workspace user, that user must be assigned a Google Workspace license that allows Gmail. ; Authentication, Check one or both boxes to set an authentication method: Only accept mail from the specified IP addresses —System accepts only messages sent from IP addresses that you specify. Require SMTP Authentication —Enforces SMTP authentication to identify the sending domain (connection through TLS required). SMTP authentication verifies the connection by checking the user Google Workspace email address and password. If you select the specified IP addresses option: Click Add . Enter a description and the IP address or range in IPv4 or IPv6 format. Use your own public IP address. You can specify up to 65,536 IP addresses in one range. For security reasons, we recommend that you keep the IP range as small as possible. Check or uncheck the Enable box to enable or disable the IP address or range. Click Save . To add more IP addresses or ranges, repeat the steps. ; Encryption, (Optional) To require TLS for connections between your server and Google, check the Require TLS encryption box. Important: If your email server doesn't support TLS and you check this box, messages not sent over an encrypted TLS connection are rejected.
A powerful email campaign lays the groundwork for a successful marketing strategy. But like a space maze full of asteroids, email delivery can be a complex and intricate process. The good news is, you can always simplify your approach by using tools that boost your efficiency. Certain software, for example, can keep your email from making wrong turns and, ultimately, help it finish the maze, fast. Here is where a free SMTP server can help scale your email delivery. But first, what is an SMTP server ? If you're new to the concept of SMTP, we'll ...
SMTP Relay Service: What Is SMTP Relay and How Does It Work? ; What is an SMTP relay service? ; How does an SMTP relay server work? ; What is an SMTP mail relay?
Download Simple .NET SMTP for free. Simple managed library for SMTP in C# Had a need for this. Supports relay mailing, direct mailing, and email address verification with many servers.
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