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# SMTP configuration and email sending | ||
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The default configuration of any Zerops project [private network](/documentation/routing/routing-between-project-services.html) blocks the SMTP 25 (legacy unsecure) and 587 (modern secure) ports from sending emails. The reason is primarily security and preventive protection against potential misuse of the offered [$20 credit](/documentation/overview/pricing.html#credit-and-free-zerops-credit) for the initial trial of Zerops for free for anyone. | ||
The default configuration of any Zerops project [private network](/documentation/routing/routing-between-project-services.html) blocks the SMTP 25 (legacy unsecured) and 587 (modern secure) ports from sending emails for security reasons. Contact us at [[email protected]](mailto:team@zerops.io) to manually enable the ports. | ||
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In practice, all **outgoing TCP ports 1 - 1024 except 22, 80, and 443**, and also all **outgoing UDP ports 1 - 65635** are blocked by the project firewall. This setting, therefore, eliminates using of the SMTP port 25 or 587 for outgoing email messages. | ||
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udp dport 1-65535 drop | ||
``` | ||
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You will be able to use the SMTP port 25 or 587 without restrictions when your Zerops account is paid, but not when using a free credit. Actually, it would be best if you asked for this unblocking the Zerops team by sending an email to [[email protected]](mailto:[email protected]). | ||
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If the SMTP port 25 and 587 is enabled, you have two principal options for configuring the applications from a technical point of view so that they can send emails: | ||
If the SMTP ports 25 and 587 are enabled, you have two principal options for configuring the applications from a technical point of view so that they can send emails: | ||
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* Directly connect to the destination SMTP server according to the DNS resolution of the recipient's email address. | ||
* Configure a connection to any public SMTP server with valid authentication credentials and send emails using it. | ||
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