Why my server can't connect to Gmail smtp?

Hi, i just checked that i’m not in any blacklist and also i my firewall is opened. My java application connects to Gmail SMTP to send e-mails, but once i moved my app to Digital Ocean, the same code i always used cannot connect to SMTP Gmail saying connect timeout.

Any clue on what’s is happening?

I thought i was missing the Reverse DNS of my droplet but i already corrected that without success.

Thanks for helping.

Show comments

Submit an answer

This textbox defaults to using Markdown to format your answer.

You can type !ref in this text area to quickly search our full set of tutorials, documentation & marketplace offerings and insert the link!

Sign In or Sign Up to Answer

These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.

Want to learn more? Join the DigitalOcean Community!

Join our DigitalOcean community of over a million developers for free! Get help and share knowledge in Q&A, subscribe to topics of interest, and get courses and tools that will help you grow as a developer and scale your project or business.

Hello marciomalewschi

To curb a recent increase in abuse and SPAM, DO has an initial SMTP block on new accounts created in certain contexts. If you file a support ticket ( the team should be able to lift that for you after some manual account verification.

Hello! I have similar problem… GMAIl is not working in DO servers. But work in (same code) in the servers of other company. I suppose it is problem of DO server settings. Please can you help me. Gmail settings:

Host name:

Port: 587

Timeout: 1000

User name:

Password: ••••••••••••••••

Protocol: SMTP Aut…: true Start TLS: true