Test SMTP connection and send test email
KB484645: Email delivery fails with error, "STARTTLS is required but host does not support STARTTLS"
email - JMeter 3.3 - Could not connect to SMTP host - Stack Overflow
SQL SERVER - Database Mail Error: The SMTP Server Requires a Secure Connection or the Client was not Authenticated. The Server Response Was: 5.5.1 - SQL Authority with Pinal Dave
Issue - Cannot connect to SMTP on Plesk for Windows with SSL or TLS | Plesk Forum
CLIENT: 220 2.0.0 Ready to start TLS -> SMTP Error: Could not connect to SMTP host. · Issue #777 · PHPMailer/PHPMailer · GitHub
![php - How to resolve SMTP could not connect error? [post STARTTLS problem] - Stack Overflow](https://i.stack.imgur.com/hDgcl.png "php - How to resolve SMTP could not connect error? [post STARTTLS problem] - Stack Overflow")
php - How to resolve SMTP could not connect error? [post STARTTLS problem] - Stack Overflow
Issue - Cannot connect to SMTP on Plesk for Windows with SSL or TLS | Plesk Forum
Drupal SMTP error "could not connect to smtp host"
Which SMTP Port to Use for Email? Common Email Ports | SparkPost
Issue - Cannot connect to SMTP on Plesk for Windows with SSL or TLS | Plesk Forum
Test SMTP with telnet or openssl • Steven Rombauts
![JENKINS-58813] Cannot send Email notification over office365 smtp with starttls has no effect - Jenkins Jira](https://issues.jenkins.io/secure/attachment/51086/jenkinsError.png "JENKINS-58813] Cannot send Email notification over office365 smtp with starttls has no effect - Jenkins Jira")
JENKINS-58813] Cannot send Email notification over office365 smtp with starttls has no effect - Jenkins Jira
Getting this error message: The message could not be sent because the connection to Outgoing server (SMTP) smtp.gmail.com was lost in the middle of | Thunderbird Support Forum | Mozilla Support
SMTP Error: Could not connect to SMTP host · Issue #1176 · PHPMailer/PHPMailer · GitHub
Settings SMTP Email Configuration - Pleasant Solutions
authentication failure STARTTLS failed code 220 response: SMTP server ready - osTicket Forum
Configure SMTP Setup - Tableau
php - PHPMailer - SMTP Error: Could not connect to SMTP host - Stack Overflow
Connection failed. Error #2: stream_socket_enable_crypto(): Peer certificate CN=`mail.icar.gov.in' did not match expected CN=`00.000.0.000' - Software Support - PKP Community Forum
Which SMTP Port Should I Use? Understanding Ports 25, 465, & 587 | Mailgun
Siva R Vaka: Issues configuring WCM Email notifications with Google SMTP configuration
SMTP Error "Must issue a STARTTLS command first" in ClearPass | Security
MailR SMTP Setup (Gmail, Outlook, Yahoo) | STARTTLS | R-bloggers
SMTP Notifications with an Office 365 Account – Datameer
