Can't connect to outgoing SMTP server (GMAIL or YAHOO)

Hi guys. I have installed Centos 6.5. At last week all worked perfectly, but now I have a problem. I can’t connect to outgoing SMTP servers from my droplet via PHP. Have same errors, something like “Server not respond” or “SMTP server can’t authenticate”, etc. Tried to connect via SSL and TLS ports. it doesn’t works. What you can say about it?

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@touf Firewall ok. My droplet IP was in blacklists, I’m created new droplet and now all works perfectly. Thanks