Connection Refused Error with Online PDF Form

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Hi,

My client has a website that contains a PDF which is accessed by a simple text link on the website. This pdf form is fillable and includes a submit online button and I believe was created using Adobe LiveCycle. The problem I'm having is that after a hosting move the form no longer works and the user just sees a message "An unexpected error occurred. Connection refused.

All other forms on the website work and emails are received.

Here is the error log:
Exception Occurred: /.../updates/concrete5.6.2.1_updater/concrete/libraries/3rdparty/Zend/Mail/Protocol/Abstract.php:277 Connection refused (0)
#0 /.../updates/concrete5.6.2.1_updater/concrete/libraries/3rdparty/Zend/Mail/Protocol/Smtp.php(167): Zend_Mail_Protocol_Abstract->_connect('tcp://smtp.post...')
#1 /.../updates/concrete5.6.2.1_updater/concrete/libraries/3rdparty/Zend/Mail/Transport/Smtp.php(199): Zend_Mail_Protocol_Smtp->connect()
#2 /.../updates/concrete5.6.2.1_updater/concrete/libraries/3rdparty/Zend/Mail/Transport/Abstract.php(348): Zend_Mail_Transport_Smtp->_sendMail()
#3 /.../updates/concrete5.6.2.1_updater/concrete/libraries/3rdparty/Zend/Mail.php(1194): Zend_Mail_Transport_Abstract->send(Object(Zend_Mail))
#4 /.../single_pages/pdf.php(52): Zend_Mail->send(Object(Zend_Mail_Transport_Smtp))
#5 /.../updates/concrete5.6.2.1_updater/concrete/core/libraries/view.php(945): include('/home3/nd...')
#6 /.../updates/concrete5.6.2.1_updater/concrete/dispatcher.php(264): Concrete5_Library_View->render(Object(Page))
#7 /.../concrete/startup/updated_core_check.php(6): require('/home3/ndideash...')
#8 /.../concrete/dispatcher.php(14): require('/home3/nd...')
#9 /.../index.php(2): require('/home3/ndideash...')
#10 {main}


I've just taken over the site and this form did work prior to the host move. I'm new to concrete5 and any help is greatly appreciated.

Update: I've located the files pdf.php and job_app_pdf.php within the single pages directory and have confirmed the information is correct for the SMTP server.

BethCM