i am using smtp extension in my magento store. mail is incoming properly and not out going.i am using mail that is my domain mail . it receives mail from store successfully but not sending that mail to customers.
SMTP error from remote mail server after end of data:
Could you please check from configuration settings - Disable Email Communications - is set to Yes or no ?
Also refer this link - this might helpful for you - https://github.com/magepal/magento2-gmail-smtp-app/issues/71