# Can’t send emails due to failed internal dns resolution

**URL:** <https://meta.discourse.org/t/can-t-send-emails-due-to-failed-internal-dns-resolution/43592>\
**Category:** Product Support\
**Created:** [May 3, 2016, 8:45am UTC](https://meta.discourse.org/t/can-t-send-emails-due-to-failed-internal-dns-resolution/43592 "2016-05-03T08:45:48Z")\
**Posts on this page:** 1\
**Showing post:** 12

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**Author:** ![gvalchca](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/gvalchca/32/44015_2.png) [@gvalchca](https://meta.discourse.org/u/gvalchca)\
**Post date:** [May 4, 2016, 3:39pm UTC](https://meta.discourse.org/t/can-t-send-emails-due-to-failed-internal-dns-resolution/43592/12 "2016-05-04T15:39:17Z")

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Ok, thanks a lot, it all finally worked,  
so:

I’ve changed the DOCKER\_OPTS:  
`DOCKER_OPTS="--ip 127.0.0.1"`

then rebuild the app with the quotations:  
`DISCOURSE_SMTP_AUTHENTICATION: 'none'`  
`DISCOURSE_SMTP_ENABLE_START_TLS: "true"`

Thx a lot!

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