Free Public Smtp Relay
We recommend that you turn on. Comprehensive mail storage trains the spam filter about addresses you send to, so that messages sent from these addresses are less likely to be marked as spam.You must turn on comprehensive mail storage if your non-Gmail system uses the SMTP Relay Service to route messages for ticket tracking systems, bug databases, or automated notification systems, and display that mail in your users’ Gmail Inboxes. If you use Google Vault and the SMTP relay service, you must also turn on comprehensive mail storage to have any messages sent through the relay archived in Vault. Limits per user.
The maximum number of messages a user can send in a 24-hour period is 10,000. However, this can vary, depending on the number of user licenses in your G Suite account. The maximum number of unique recipients allowed per user per 24-hour period is approximately 130 times the number of user licenses in your G Suite account.Notes:.If a user exceeds either of these limits, the '550 5.4.5 Daily SMTP relay limit exceeded for user' error appears.Google servers can handle more than 100 recipients per transaction. However, RFC 5321 limits might block some transactions.The message count is based on the address of the envelope sender presented during the SMTP relay transaction. If the envelope sender is not a registered user, then the per-user limits don't apply.
Addresses in the From: and Reply-to: fields are not considered. Nor do we consider the address presented during SMTP authentication, which is turned on if you select the Require SMTP Authentication option, described below.Any sender, whether or not they're a registered user, can also be prevented from sending messages if a customer relay limit has been reached. In this case, they see a different error message based on limits per customer.Important: To increase SMTP relay limits, you must pay a Google-generated bill before relay limits are increased. (This is unlike increasing Gmail limits, which can be initiated by ) Limits per customerThese limits are determined by the number of user licenses in your G Suite account. For small customers, these limits come into effect much earlier than the limits per user.There are two per-customer limits:. The maximum number of total recipients allowed per customer per 24-hour period is approximately 130 times the number of user licenses in your G Suite account, with an upper bound of 4,600,000 recipients per 24-hour period for large customers.
The internal SMTP server has no accounts - it's just a dummy virtual server that does nothing more than relay mail to O365 through the mx record host. There's one catch. Even though all the accounts are based on domain.com, all the accounts have a domain.gov alias.
If a customer exceeds this limit, users see the error '550 5.7.1 Daily SMTP relay limit exceeded for customer.' . The maximum number of total recipients allowed per customer in a 10-minute window is approximately 9 times the number of user licenses in your G Suite account, with an upper bound of 319,444 recipients per 10-minute window for large customers. If a customer exceeds this limit, users see the error '450 4.2.1 Peak SMTP relay limit exceeded for customer.'
Additional notes. The per-user recipient limits are for unique recipients, while the per customer limits are for total recipients.
From the Admin console Home page, go to Apps G Suite Gmail Advanced settings.Tip: To see Advanced settings, scroll to the bottom of the Gmail page. On the left, select the top-level organization.
See for more details.Note: You can configure the SMTP relay service setting for the top-level organization only. You can view the setting from the sub-organization level when it's added, but you can't add, edit, or delete the setting from the sub-organization level. Scroll to the SMTP relay service setting in the Routing section, hover over the setting, and click Configure.
If the setting is already configured, hover over the setting and click Edit or Add another. For a new setting, enter a unique description. In the Allowed senders section, select the users who are allowed to send messages through the SMTP relay service:. Only registered Apps users in my domain—The sender must be a registered user in one of your domains. Only addresses in my domains—The sender doesn't have to be a recognized G Suite user, but must be in one of your registered domains. This can be useful when you have third-party or custom applications that need to send messages.
Any addresses (not recommended)—The sender address can be anything, even an address outside of your domain. The Any addresses option makes you more vulnerable to abuse, either through malware on your user’s machines or by misconfiguration of your SMTP infrastructure.
Free Public Smtp Relay Test
Therefore, we don't recommend this option.For the Any address option to work properly, you must configure your mail server either to use SMTP AUTH to identify the sending domain or to present one of your domain names in the HELO or EHLO command. See the instructions below for configuring your specific server type. If you don't have an Edge Server, follow the instructions below to set up the SMTP relay service for Exchange 2007/2010. In this case, set up Outbound Services on a Hub Transport server.You don't need to increase the timeouts for Microsoft Exchange 2007/2010 mail servers. For Microsoft Exchange 2007/2010, different servers are assigned distinct, concrete roles.
An Edge Server is one such role. The Edge Server connects all other Exchange Servers to the Internet, and provides filtering and security.To send messages on an edge transport server, you must configure a send connector. Send connectors are created and edited in the Exchange Management Console. Follow the instructions below to set up the SMTP relay service for Exchange 2007/2010 on your Edge Server.You don't need to increase the timeouts for Microsoft Exchange 2007/2010 mail servers. Follow the instructions below to set up the SMTP relay service for IBM Lotus Domino. These instructions, which were written for Lotus Domino R5/R6, are designed to work with a majority of deployments.You don't need to change the timeout configuration for Lotus Domino R5/R6. You can use the default timeout settings.Set up a smart host and adjust the Retry Interval:.Open Domino Administrator.Click Administration and select the Configuration tab.Click Configurations.Double-click the name of your Domino Server.At the top of the window, click Edit Server Configuration.Select the Router/SMTP tab in the first row.
Follow the instructions below to set up the SMTP relay service for Novell Groupwise. These instructions are designed to work with a majority of deployments. Follow the instructions below to set up the SMTP relay service for Sendmail. These instructions are designed to work with a majority of deployments.Changing server timeouts should not be necessary.
In Sendmail, the server timeout is set in the Timeout.datafinal value. By default, it's set to one hour. Follow the instructions below to set up the SMTP relay service for Apple Macintosh OS X. Follow these instructions to set up the SMTP relay service for Qmail.
The instructions are designed to work with a majority of deployments.You might first need to increase server timeouts before setting up a smart host. The default timeout is 1200 seconds, which is long enough. Follow the instructions below to set up the SMTP relay service for Postfix. These instructions are designed to work with a majority of deployments. There is no need to increase the timeouts for Postfix servers.