STARTTLS error when sending alerts from Cloudera manager - cloudera

I'm trying to adjust alerts using Cloudera's Alert publisher (v. 5.14). Here are my alert publisher's settings from Cloudera's UI:
- Enable Email Alerts: true
- Mail Server Protocol: smtp
- Mail Server Hostname: smtp.gmail.com
- Mail Server Username: sender#hadoop-cluster.org
- Mail From Address: sender#hadoop-cluster.org
- Mail Message Recipients: recipient#gmail.com
- Mail Server TCP Port: 587
Any others configs I left by default. Sender's and recipient's emails was obfuscated in this snippet but I can say that "hadoop-cluster.org" is a domain which have a GSuite record so SMTP configs of hadoop-cluster.org should be similar to GMail configs.
When I've applied these settings and restart Cloudera management service I've tried to send test alert. In alert publister's logs I'm catching the following exception:
com.sun.mail.smtp.SMTPSendFailedException: 530 5.7.0 Must issue a STARTTLS command first. p10*****.47 - gsmtp
at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:1829)
at com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:1368)
at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:886)
at org.springframework.mail.javamail.JavaMailSenderImpl.doSend(JavaMailSenderImpl.java:416)
at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:340)
at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:355)
at org.springframework.mail.javamail.JavaMailSenderImpl.send(JavaMailSenderImpl.java:344)
at org.apache.camel.component.mail.MailProducer.process(MailProducer.java:44)
at org.apache.camel.impl.converter.AsyncProcessorTypeConverter$ProcessorToAsyncProcessorBridge.process(AsyncProcessorTypeConverter.java:50)
What I'm doing wrong? I've searched the answer on Cloudera's community forums but didn't found any useful advises.

Must issue a STARTTLS command
Enable TLS security by configuring Mail Server Protocol: smtps
Restart cloudera management service and trigger a test email. Don't need to explicitly specify tls port. It will use port 587 by default.
https://developers.google.com/gmail/imap/imap-smtp

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Update: I am using Gmail SMTP server name in order to send e-mails and I am getting the error "The server rejected the sender address. The server response was: 530 5.7.0 Must issue a STARTTLS command first. ye1sm22267001pab.19 - gsmtp"
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Greg.Forsythe
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http://msdn.microsoft.com/en-us/library/gg634591.aspx
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I have wordpress site attempting to use Contact for 7 and POSTMAN SMTP plugins
Postman has diag routine, it clearly shows that 1and1 are blocking the only mail port open is 443.

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