# 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:** 13

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**Author:** ![fantasticfears](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/fantasticfears/32/119608_2.png) [@fantasticfears](https://meta.discourse.org/u/fantasticfears)\
**Post date:** [May 4, 2016, 3:55pm UTC](https://meta.discourse.org/t/can-t-send-emails-due-to-failed-internal-dns-resolution/43592/13 "2016-05-04T15:55:21Z")

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> [@gvalchca](#):
>
> I’ve changed the DOCKER\_OPTS:DOCKER\_OPTS=“–ip 127.0.0.1”

If that SMTP server should only works in your institution, sure you need your own DNS server.

Beyond that, I guess you reject all kinds of access from outside your LAN.

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