email stopped working

Somewhy my email seems to stop working returning to "The Bat!" something like "unable to connect to the server. The target machine actively refused it" (esp: SEND - No se pudo conectar con el servidor. No se puede establecer una conexión ya que el equipo de destino denegó expresamente dicha conexión) - when trying to send an email. Receiving doesn't complain, but doesn't work either.

I've found out because a cliente has contacted with this message that an email he sent me has bounced back:

Code:

This is the Postfix program at host deferred-out-119.livemail.co.uk.I'm sorry to have to inform you that the message returnedbelow could not be delivered to one or more destinations.For further assistance, please send mail to <postmaster>If you do so, please include this problem report. You candelete your own text from the message returned below.			The Postfix program<info@domain.eu>: connect to domain.eu[79.143.xxx.xxx]: Connection refused

I've sent emails myself from Yahoo! and Gmail and they neither bounce back nor do I receive them.

Last email I've received was at January 2. I don't know if it matters, but my configuration still used info+domain.eu as user and not info@domain.eu (maybe that helps to track when / what went wrong) - but changing it doesn't seem to make any difference.

 

There doesn't seem to be anything interesting over there. I'm unable to find any reference to the email address I've been testing.

Just tested from Yahoo webmail and I don't get any error, but the CPanel webmail doesn't show that it has received my email.

 

Just accessed Horde webmail, and I'm getting this when sending an email:

/usr/local/cpanel/3rdparty/php/54/lib/php/Horde/Smtp/../../../locale is not a directory

Does that shine any light?

 

I've changed the mailserver to Courier, and then back to Dovecot and the issues seems to be fixed.