There was a problem while sending a test email. Related debugging output is shown below:

Versions:
WordPress: 4.9.4
WordPress MS: No
PHP: 7.0.28-0ubuntu0.16.04.1
WP Mail SMTP: 1.2.5

Params:
Mailer: smtp
Constants: No
ErrorInfo: SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting
Host: secure.emailsrvr.com
Port: 2525
SMTPSecure: ssl
SMTPAutoTLS: bool(true)
SMTPAuth: bool(true)

Server:
OpenSSL: Yes
SMTP Debug:
2018-04-26 19:13:09	Connection: opening to ssl://secure.emailsrvr.com:2525, timeout=300, options=array (
)
2018-04-26 19:13:09	Connection: Failed to connect to server. Error number 2. "Error notice: stream_socket_client(): SSL operation failed with code 1. OpenSSL Error messages:
error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol
2018-04-26 19:13:09	Connection: Failed to connect to server. Error number 2. "Error notice: stream_socket_client(): Failed to enable crypto
2018-04-26 19:13:09	Connection: Failed to connect to server. Error number 2. "Error notice: stream_socket_client(): unable to connect to ssl://secure.emailsrvr.com:2525 (Unknown error)
2018-04-26 19:13:09	SMTP ERROR: Failed to connect to server: (0)
2018-04-26 19:13:09	SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting
Please copy only the content of the error debug message above, identified with an orange left border, into the support forum topic if you experience any issues.