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SMTP Connect Failed

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Hi! I have been trying to troubleshoot this error but i am still not able to resolve it.

It keeps showing this error, below. Is there a way for me to resolve it??

The SMTP debugging output is shown below:
2018-05-15 18:34:05 Connection: opening to smtp.office365.com:587, timeout=300, options=array (
)
2018-05-15 18:34:05 Connection: opened
2018-05-15 18:34:05 SMTP -> get_lines(): $data is “”
2018-05-15 18:34:05 SMTP -> get_lines(): $str is “220 SG2PR06CA0166.outlook.office365.com Microsoft ESMTP MAIL Service ready at Tue, 15 May 2018 18:34:05 +0000

2018-05-15 18:34:05 SERVER -> CLIENT: 220 SG2PR06CA0166.outlook.office365.com Microsoft ESMTP MAIL Service ready at Tue, 15 May 2018 18:34:05 +0000
2018-05-15 18:34:05 CLIENT -> SERVER: EHLO http://www.avantustraining.com
2018-05-15 18:34:05 SMTP -> get_lines(): $data is “”
2018-05-15 18:34:05 SMTP -> get_lines(): $str is “250-SG2PR06CA0166.outlook.office365.com Hello [129.126.144.147]

2018-05-15 18:34:05 SMTP -> get_lines(): $data is “250-SG2PR06CA0166.outlook.office365.com Hello [129.126.144.147]

2018-05-15 18:34:05 SMTP -> get_lines(): $str is “250-SIZE 157286400

2018-05-15 18:34:05 SMTP -> get_lines(): $data is “250-SG2PR06CA0166.outlook.office365.com Hello [129.126.144.147]
250-SIZE 157286400

2018-05-15 18:34:05 SMTP -> get_lines(): $str is “250-PIPELINING

2018-05-15 18:34:05 SMTP -> get_lines(): $data is “250-SG2PR06CA0166.outlook.office365.com Hello [129.126.144.147]
250-SIZE 157286400
250-PIPELINING

2018-05-15 18:34:05 SMTP -> get_lines(): $str is “250-DSN

2018-05-15 18:34:05 SMTP -> get_lines(): $data is “250-SG2PR06CA0166.outlook.office365.com Hello [129.126.144.147]
250-SIZE 157286400
250-PIPELINING
250-DSN

2018-05-15 18:34:05 SMTP -> get_lines(): $str is “250-ENHANCEDSTATUSCODES

2018-05-15 18:34:05 SMTP -> get_lines(): $data is “250-SG2PR06CA0166.outlook.office365.com Hello [129.126.144.147]
250-SIZE 157286400
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES

2018-05-15 18:34:05 SMTP -> get_lines(): $str is “250-STARTTLS

2018-05-15 18:34:05 SMTP -> get_lines(): $data is “250-SG2PR06CA0166.outlook.office365.com Hello [129.126.144.147]
250-SIZE 157286400
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-STARTTLS

2018-05-15 18:34:05 SMTP -> get_lines(): $str is “250-8BITMIME

2018-05-15 18:34:05 SMTP -> get_lines(): $data is “250-SG2PR06CA0166.outlook.office365.com Hello [129.126.144.147]
250-SIZE 157286400
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-STARTTLS
250-8BITMIME

2018-05-15 18:34:05 SMTP -> get_lines(): $str is “250-BINARYMIME

2018-05-15 18:34:05 SMTP -> get_lines(): $data is “250-SG2PR06CA0166.outlook.office365.com Hello [129.126.144.147]
250-SIZE 157286400
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-STARTTLS
250-8BITMIME
250-BINARYMIME

2018-05-15 18:34:05 SMTP -> get_lines(): $str is “250-CHUNKING

2018-05-15 18:34:05 SMTP -> get_lines(): $data is “250-SG2PR06CA0166.outlook.office365.com Hello [129.126.144.147]
250-SIZE 157286400
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-STARTTLS
250-8BITMIME
250-BINARYMIME
250-CHUNKING

2018-05-15 18:34:05 SMTP -> get_lines(): $str is “250 SMTPUTF8

2018-05-15 18:34:05 SERVER -> CLIENT: 250-SG2PR06CA0166.outlook.office365.com Hello [129.126.144.147]
250-SIZE 157286400
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-STARTTLS
250-8BITMIME
250-BINARYMIME
250-CHUNKING
250 SMTPUTF8
2018-05-15 18:34:05 CLIENT -> SERVER: STARTTLS
2018-05-15 18:34:05 SMTP -> get_lines(): $data is “”
2018-05-15 18:34:05 SMTP -> get_lines(): $str is “220 2.0.0 SMTP server ready

2018-05-15 18:34:05 SERVER -> CLIENT: 220 2.0.0 SMTP server ready
2018-05-15 18:34:05 SMTP Error: Could not connect to SMTP host.
2018-05-15 18:34:05 CLIENT -> SERVER: QUIT
2018-05-15 18:34:05 SMTP -> get_lines(): $data is “”
2018-05-15 18:34:05 SMTP -> get_lines(): $str is “”
2018-05-15 18:34:05 SERVER -> CLIENT:
2018-05-15 18:34:05 SMTP ERROR: QUIT command failed:
2018-05-15 18:34:05 Connection: closed
2018-05-15 18:34:05 SMTP Error: Could not connect to SMTP host.


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