Added my server IP to the /etc/hosts file
Starting mail system...
mail.smtp.host = email-smtp.us-east-1.amazonaws.com
mail.smtp.starttls.enable = true
mail.smtp.port = 25
mail.from = no-reply@density.io
mail.smtp.connectiontimeout = 30000
mail.smtp.timeout = 30000
mail.smtp.auth = true
username = AKIAI2OHMLB7M2CIJHNQ
password = *******
Mail system started.
Invalid user email '' - using server email as from address.
DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Sun Microsystems, Inc]
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: trying to connect to host "email-smtp.us-east-1.amazonaws.com", port 25, isSSL false
220 email-smtp.amazonaws.com ESMTP SimpleEmailService-2110753669 7yyiErG1p2Ow5Qfl2guB
DEBUG SMTP: connected to host "email-smtp.us-east-1.amazonaws.com", port: 25
EHLO
501 Syntax: EHLO hostname
HELO
501 Syntax: HELO
problem sending email
501 Syntax: HELO
at com.sun.mail.smtp.SMTPTransport.issueCommand(SMTPTransport.java:1363)
at com.sun.mail.smtp.SMTPTransport.helo(SMTPTransport.java:838)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:375)
at javax.mail.Service.connect(Service.java:297)
at javax.mail.Service.connect(Service.java:156)
