Roundcube hangs while sending mail

[amin]

 When I want to send email , only sending message.... show and email not send and Roundcube hang!

[erm3nda]

Logs please. Look at /var/log/maillog.
As example

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tail /var/log/maillog

You can export it to a txt file to copy/paste/read it by:

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tail /var/log/maillog > ~/mail.log