Can't send mail with $mail.send method in Azure

Question

According to the logs, we cannot establish a connection with the host. For some reason the host is blocking the connection.
So we suggest that it's necessary to contact the host administrator and check the correctness of the port settings. Could you please check our host settings?

Now we have the error:

Unable send email for request MailRequest    
com.sun.mail.smtp.SMTPSendFailedException: 451 5.7.3 STARTTLS is required to send mail [GV3P280CA0083.SWEP280.PROD.OUTLOOK.COM]      
      
at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:2373)       
at com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:1808)       
at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1285)       
at com.justai.zb.jsapi.mail.MailService.lambda$send$1(MailService.java:52)       
at com.justai.zb.jsapi.mail.MailService.sendWithTimeCheck(MailService.java:159)       
at com.justai.zb.jsapi.mail.MailService.send(MailService.java:52)       
at com.justai.zb.jsapi.mail.MailServiceJSAdapter.send(MailServiceJSAdapter.java:34)       
at jdk.nashorn.internal.scripts.Script$60817$mail.$mail#sendInternal(/jsapi/mail.js:74)       
at jdk.nashorn.internal.scripts.Script$60817$mail.$mail#send(/jsapi/mail.js:66)       
at jdk.nashorn.internal.scripts.Script$60825$generated$cu98.script__src_themes_veeva_sc_224_33(/var/lib/justai/botserver/bots/3thtEuJo5s1fBxhZPoBK5z/1000034616-testirovanie_v_teams-1000034616-FjL-20939971500/1000034616-testirovanie_v_teams-1000034616-FjL-20939971500/420/generated.js:20131)       
at jdk.nashorn.internal.runtime.ScriptFunctionData.invoke(ScriptFunctionData.java:639)       
at jdk.nashorn.internal.runtime.ScriptFunction.invoke(ScriptFunction.java:494)       
at jdk.nashorn.internal.runtime.ScriptRuntime.apply(ScriptRuntime.java:393)       
at jdk.nashorn.api.scripting.ScriptObjectMirror.callMember(ScriptObjectMirror.java:199)       
at com.justai.zb.scenarios.engine.ScriptingEngine.lambda$executeScript$2(ScriptingEngine.java:157)       
at com.justai.zb.scenarios.engine.ScriptingEngine.executeJS(ScriptingEngine.java:143)       
at com.justai.zb.scenarios.engine.SandboxScriptingEngine.lambda$executeJS$0(SandboxScriptingEngine.java:93)       
at com.justai.zb.scenarios.engine.sandbox.JsEvaluator.run(JsEvaluator.java:89)       
at java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1402)       
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)       
at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)       
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)      

or these type:

Unable send email for request MailRequest     
com.sun.mail.util.MailConnectException: Couldn't connect to host, port: XXX, X; timeout -1       
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:2209)       
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:722)       
at javax.mail.Service.connect(Service.java:342)       
at com.justai.zb.jsapi.mail.MailService.createTransportAndConnect(MailService.java:112)       
at com.justai.zb.jsapi.mail.MailService.lambda$send$0(MailService.java:49)       
at com.justai.zb.jsapi.mail.MailService.connectWithTimeCheck(MailService.java:141)       
at com.justai.zb.jsapi.mail.MailService.send(MailService.java:48)       
at com.justai.zb.jsapi.mail.MailServiceJSAdapter.send(MailServiceJSAdapter.java:34)       
at jdk.nashorn.internal.scripts.Script$65610$mail.$mail#sendInternal(/jsapi/mail.js:74)       
at jdk.nashorn.internal.scripts.Script$65610$mail.$mail#send(/jsapi/mail.js:66)       
at jdk.nashorn.internal.scripts.Script$65618$generated$cu98.script__src_themes_veeva_sc_140_17(/var/lib/justai/botserver/bots/3thtEuJo5s1fBxhZPoBK5z/1000034616-testirovanie_v_teams-1000034616-FjL-20939971500/1000034616-testirovanie_v_teams-1000034616-FjL-20939971500/450/generated.js:20082)       
at jdk.nashorn.internal.runtime.ScriptFunctionData.invoke(ScriptFunctionData.java:639)       
at jdk.nashorn.internal.runtime.ScriptFunction.invoke(ScriptFunction.java:494)       
at jdk.nashorn.internal.runtime.ScriptRuntime.apply(ScriptRuntime.java:393)       
at jdk.nashorn.api.scripting.ScriptObjectMirror.callMember(ScriptObjectMirror.java:199)       
at com.justai.zb.scenarios.engine.ScriptingEngine.lambda$executeScript$2(ScriptingEngine.java:157)       
at com.justai.zb.scenarios.engine.ScriptingEngine.executeJS(ScriptingEngine.java:143)       
at com.justai.zb.scenarios.engine.SandboxScriptingEngine.lambda$executeJS$0(SandboxScriptingEngine.java:93)       
at com.justai.zb.scenarios.engine.sandbox.JsEvaluator.run(JsEvaluator.java:89)       
at java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1402)       
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)       
at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)       
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)       
at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:175)       
Caused by: java.net.UnknownHostException: XXX  
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184)       
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)       
at java.net.Socket.connect(Socket.java:607)       
at java.net.Socket.connect(Socket.java:556)       
at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:335)       
at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:214)       
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:2160)       
... 23 common frames omitted      

{ "status": "UNABLE_TO_CONNECT" }      

Thanks in advance!