java - Suddenly not able to send email by amazon SES - unable to connect smtp host -


i using amazon ses 4 months same code, same port number(25) same. past 1 week not able send email - while sending error comes:

the email not sent.
error message: not connect smtp host: email-smtp.us-east-1.amazonaws.com, port: 25

i using same code sending email amazon suggests use link (http://docs.aws.amazon.com/ses/latest/developerguide/send-using-smtp-java.html)

we working on website project , using inside it. not problem me alone, team members of 4 working under same internet gateway, of them not able send email 1 week localhost.

but when deploy same code on amazon ec2, top-level domain sample.com starts working when deploy same code under sub-domain beta.sample.com again same error starts coming.

does have idea this?

try sending email via email-smtp.us-east-1.amazonaws.com:587.

outgoing connections smtp (25) port may blocked firewall stop outgoing spam.

can telnet of 2 ports? smtp greeting messages?

telnet email-smtp.us-east-1.amazonaws.com 25 telnet email-smtp.us-east-1.amazonaws.com 587

https://en.wikipedia.org/wiki/mail_submission_agent

many internet service providers , enterprise or institutional networks restrict ability connect remote mtas on port 25. accessibility of mail submission agent on port 587[1] enables nomadic users continue send mail via preferred submission servers within others' network


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