the email node was configured with hostingermail but now its saying Error upgrading connection with STARTTLS: 454 4.3.0 Try again later
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welcome to the n8n community @musab_bin_aslam
What I’d suggest here is changing the SMTP security mode in your email credential. I’ve seen this error go away after switching from STARTTLS on port 587 to SSL/TLS on port 465 with Hostinger Mail. If you want to keep using port 587, I’d also try enabling Disable STARTTLS in the credential settings. After saving the credential, I’d reconnect it and test again. In cases like this, the fix is usually in the SMTP security configuration rather than in the Email node itself.
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hostinger especially gets those credential cache issues sometimes. whats worked for us is not just re-saving, but fully deleting the credential from the list then creating fresh. the old connection state can stick around even after switching security modes.
Outbound firewall - Hostinger VPS often blocks SMTP ports by default:
sudo ufw allow 587
sudo ufw allow 465
sudo ufw status
Fresh SMTP password (not account password): hPanel >.Emails > Manage > “Generate new password” → copy exact app password Docker users: docker restart n8n after credential changes (connection state sticks). Test outside n8n first: telnet smtp.hostinger.com 587
If no response from Hostinger/server issue, not your config.
special thanks to you grateful
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