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The application is running in Docker container. I do not have this problem when running in a clean VM. 

2016-10-18 21:26:14,495[nio-8080-exec-4]  [INFO ] [com.xxx.mail.MailSender 102]     - Sending from noreply@172.17.0.1 to xxx@gmail.com with subject Hello World
2016-10-18 21:26:14,517[nio-8080-exec-4]  [ERROR] [com.xxx.mail.MailSender 107]     - 501 5.1.7 Bad sender address syntax

I tried configuring /etc/postfix/main.cf to allow mynetworks to which I added this IP. Did not work.

I am running the app in an Alpine docker container

bianchi
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1 Answers1

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noreply@172.17.0.1 is indeed bad syntax. An address literal ("172.17.0.1") needs to be enclosed in square brackets: 

   noreply@[172.17.0.1]
Ralf Hildebrandt
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