private fun connectMailBuilder() {
        mailBuilder = MailerBuilder
            .withSMTPServer(
                System.getenv("POSTFIX_HOST"),
                25,
                System.getenv("POSTFIX_USER"),
                System.getenv("POSTFIX_PASSWORD")
            )
            .withProperty("mail.smtp.ssl.enable", false)
            .withDebugLogging(false)
            .async()

        pooledMailer = mailBuilder
            .withConnectionPoolCoreSize(1)
            .withConnectionPoolMaxSize(2)
            .withConnectionPoolClaimTimeoutMillis(1)
            .withConnectionPoolExpireAfterMillis(59000)
            .withTransportModeLoggingOnly(false)
            .buildMailer()

        connect.set(true)
    }

Exception in thread "pool-1-thread-1" org.simplejavamail.smtpconnectionpool.TransportHandlingException: Error when trying to open connection to the server, session:
	{mail.smtp.user=utp1-postfix, mail.smtp.ssl.trust=*, mail.smtp.port=25, mail.smtp.auth=true, mail.smtp.starttls.enable=true, mail.smtp.host=00.000.000.000, simplejavamail.transportstrategy=SMTP, mail.smtp.ssl.enable=false, mail.smtp.connectiontimeout=60000, mail.transport.protocol=smtp, mail.smtp.writetimeout=60000, mail.smtp.starttls.required=false, mail.smtp.timeout=60000, SESSION_BASED_EMAIL_TO_MIME_MESSAGE_CONVERTER_KEY=SessionBasedEmailToMimeMessageConverter(session=jakarta.mail.Session@592a514a, operationalConfig=OperationalConfigImpl(async=true, properties={mail.smtp.ssl.enable=false}, sessionTimeout=60000, threadPoolSize=10, threadPoolKeepAliveTime=1, clusterKey=70f8eadc-ebaa-4bee-a059-c7c69049f7d9, connectionPoolCoreSize=1, connectionPoolMaxSize=2, connectionPoolClaimTimeoutMillis=1, connectionPoolExpireAfterMillis=59000, connectionPoolLoadBalancingStrategy=ROUND_ROBIN, transportModeLoggingOnly=false, debugLogging=false, disableAllClientValidation=false, sslHostsToTrust=[], trustAllSSLHost=true, verifyingServerIdentity=true, executorService=org.simplejavamail.internal.batchsupport.concurrent.NonJvmBlockingThreadPoolExecutor@5c29bb95[Running, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 0], executorServiceIsUserProvided=false, customMailer=null), emailGovernance=EmailGovernanceImpl(emailValidator=EmailValidator[validationRuleCount=3], emailDefaults=Email{
	id=null
	sentDate=null
	fromRecipient=null,
	replyToRecipients=[],
	bounceToRecipient=null,
	text='null',
	textHTML='null',
	textCalendar='null (method: null)',
	contentTransferEncoding='quoted-printable',
	subject='null',
	recipients=[]
}, emailOverrides=Email{
	id=null
	sentDate=null
	fromRecipient=null,
	replyToRecipients=[],
	bounceToRecipient=null,
	text='null',
	textHTML='null',
	textCalendar='null (method: null)',
	contentTransferEncoding='quoted-printable',
	subject='null',
	recipients=[]
}, maximumEmailSize=null))}
	at org.simplejavamail.smtpconnectionpool.TransportAllocator.connectTransport(TransportAllocator.java:73)
	at org.simplejavamail.smtpconnectionpool.TransportAllocator.allocate(TransportAllocator.java:45)
	at org.simplejavamail.smtpconnectionpool.TransportAllocator.allocate(TransportAllocator.java:28)
	at org.bbottema.genericobjectpool.GenericObjectPool$AutoAllocatorDeallocator.allocatedCorePoolAndDeallocateOneOrPlanDeallocations(GenericObjectPool.java:266)
	at org.bbottema.genericobjectpool.GenericObjectPool$AutoAllocatorDeallocator.run(GenericObjectPool.java:256)
	at java.base/java.lang.Thread.run(Thread.java:840)
Caused by: jakarta.mail.MessagingException: Could not convert socket to TLS;
  nested exception is:
	java.io.IOException: Can't verify identity of server: 00.000.000.000
	at org.eclipse.angus.mail.smtp.SMTPTransport.startTLS(SMTPTransport.java:2173)
	at org.eclipse.angus.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:741)
	at jakarta.mail.Service.connect(Service.java:367)
	at jakarta.mail.Service.connect(Service.java:225)
	at jakarta.mail.Service.connect(Service.java:174)
	at org.simplejavamail.smtpconnectionpool.TransportAllocator.connectTransport(TransportAllocator.java:70)
	... 5 more
Caused by: java.io.IOException: Can't verify identity of server: 00.000.000.000
	at org.eclipse.angus.mail.util.SocketFetcher.checkServerIdentity(SocketFetcher.java:699)
	at org.eclipse.angus.mail.util.SocketFetcher.configureSSLSocket(SocketFetcher.java:636)
	at org.eclipse.angus.mail.util.SocketFetcher.startTLS(SocketFetcher.java:555)
	at org.eclipse.angus.mail.smtp.SMTPTransport.startTLS(SMTPTransport.java:2168)
	... 10 more