Sending Emails via External SMTP (List of Allowed Servers)
For sending emails from web applications (e.g., e-shop order confirmations, WordPress notifications), we support SMTP sending via external servers. For security reasons and to protect IP addresses from spam, we recommend sending emails over secured ports (465 and 587).
List of Allowed External SMTP Servers
When configuring your application (or SMTP plugin), please use the provider's address from the following table:
| Provider / Service | Allowed SMTP Address |
|---|---|
| Google Workspace / Gmail | smtp.gmail.comsmtp-relay.gmail.com |
| Microsoft 365 | smtp.office365.com |
| Seznam.cz (Email Profi) | smtp.seznam.cz |
| SendGrid | smtp.sendgrid.net |
| Mailgun | smtp.mailgun.orgsmtp.eu.mailgun.org |
| Brevo (formerly Sendinblue) | smtp-relay.brevo.com |
| Ecomail.cz | smtp.ecomailapp.cz |
| MXroute | fusion.mxrouting.net |
| Vedos | wes1-smtp.wedos.netwes2-smtp.wedos.net |
Important notice regarding DNS (SPF and DKIM):
Even though you are sending emails through an external service, the messages are sent under your domain. Therefore, do not forget to set the correct SPF and DKIM records for your domain according to the instructions of your external SMTP provider. This will prevent your emails from falling into spam.
Even though you are sending emails through an external service, the messages are sent under your domain. Therefore, do not forget to set the correct SPF and DKIM records for your domain according to the instructions of your external SMTP provider. This will prevent your emails from falling into spam.
Correct Configuration in Your Application
- For an encrypted SSL/TLS connection, use port 465.
- For an encrypted STARTTLS connection, use port 587.
Is your provider missing from the list?
We regularly update the list of allowed servers. If you are using a legitimate email or transactional service that is missing from the list above, do not hesitate to contact our technical support with a request to add it.