XenForo server errors sending e-mails with external mail server?!

[zoldos]

I've been using an external service to send e-mails for about a month. Most of the time, everything works. But I'll get this server error and severaal more like it occasianlly:

Code:

Swift_TransportException: Email to xxxxx@yahoo.com from xxxx@bloodofsouls.com failed: Connection could not be established with host xxxxmail.ch :stream_socket_client(): Unable to connect to tcp://xxxx:587 (Connection timed out) src/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/StreamBuffer.php:261...

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