Sometimes you got this message when test with Mageplaza SMTP.
Error message: Connection timed out



1. Hosting Provider Block Sending ports

Your hosting/server may block 25, 465, or 587 port.

The following Server block these ports are:
- Google Cloud Compute: How to resolve use Sendgrid, Mailgun, Mailjet

2. Firewall

Your server firewall may block the SMTP host or ports, try to check these things.
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