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Hi... try Postfix again. And after migrating, reinstall the roundcube again.

Hi!! My Firewall is ok. I migrated the courier to dovecot. The problem persisted. So I reinstalled Postfix. And the miracle happened! The roundcube is sending emails normally. Thanks to all for your help. :D

not works :(

Now, error is SMTP 220. [10-Aug-2018 11:14:20 UTC] ERROR: STARTTLS failed () [10-Aug-2018 11:14:20 UTC] ERROR: Invalid response code received from server (-$ [10-Aug-2018 11:14:20 UTC] ERROR: Failed to write to socket: unknown error () [10-Aug-2018 11:14:20 +0000]: <anfbepgq> SMTP Error...

hi Trialotto! i did an upgrade from Plesk 17.5.3 to version 17.8.11 error log: [08-Aug-2018 20:15:08 UTC] ERROR: stream_socket_client(): unable to connect to $ [08-Aug-2018 20:15:08 UTC] ERROR: Failed to connect socket: stream_socket_clien$ [08-Aug-2018 20:15:08 +0000]: <c1hk1r0d> SMTP Error...

I'm having the same problem, after updating Plesk. I'm using Plesk Onyx 17.8.11 on a Ubuntu 16.04.5 VPS. Postfix. After update, when i use roundcube, an error appears: SMTP Error(-1): Connection failed If I use horde, the email is sent normally.