The 504 timeout error typically occurs due to issues with network connectivity or the SMTP server. It often indicates that the connection between the SMTP client and the SMTP server timed out.
It can occur due to a variety of reasons. The most common reason is incorrect SMTP server settings. An incorrect host address or port can lead to server timeouts.
The timeout error can also occur if your server is overloaded with too many requests. SMTP servers can be overloaded if you’re sending emails with large attachments.
Resolving the Error – Solution
To fix this error, we recommend checking your SMTP server configuration. SMTP servers on port 25 often experience restrictions that potentially lead to the timeout error.
If that is the case, the best option is to use a different port for your SMTP server settings. An alternative is to use port 587, which is secure and supports SMTP.
Another way to fix the SMTP timeout error is to ensure your server can accommodate requests from your SMTP client. If the server is unable to handle requests from your SMTP server, we suggest upgrading to a larger provider capable of handling your site’s increasing requests.